Method and apparatus for mapping and detecting control channel

ABSTRACT

A method and apparatus for mapping and detecting control channel are provided. The method for mapping a control channel includes: for the same aggregation level, according to a signaling length of a control channel corresponding to a component carrier, determining a corresponding search space for at least two control channels that have the same signaling length, so as to enable the at least two control channels that have the same signaling length to use the same search space, and mapping the at least two control channels that have the same signaling length to the determined corresponding search space. Therefore, conflicts between the control channels are reduced, and the number of times of blind detection of the control channels is also reduced.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of International Application No.PCT/CN2010/073936, filed on Jun. 13, 2010, which claims priority toChinese Patent Application No. 200910107882.0, filed on Jun. 16, 2009and Chinese Patent Application No. 200910165300.4, filed on Aug. 13,2009, all of which are hereby incorporated by reference in theirentireties.

FIELD OF THE INVENTION

The present disclosure relates to the field of communicationtechnologies, and in particular, to a method for mapping a controlchannel, a method for detecting a control channel and devices thereof.

BACKGROUND OF THE INVENTION

In a 3rd Generation Partnership Project (3GPP) evolved universalterrestrial radio access (E-UTRA) communication system, duringtransmission of a physical data channel for a user equipment (UE), theUE needs to be notified through scheduling assignment instructions ofthe system. The scheduling assignment instructions are usually borne bya physical downlink control channel (PDCCH), and the schedulingassignment instruction is, for example, a downlink scheduling grant(DL_grant) corresponding to a physical downlink shared channel (PDSCH)and an uplink scheduling grant (UL_grant) corresponding to a physicaluplink shared channel (PUSCH).

In a long-term evolution (LTE) frequency division duplex (FDD) system,data transmission can only be performed on a pair of uplink and downlinkcomponent carriers at a UE side and a network side, the PDCCH includestwo types of scheduling indication signaling: DL_grant and UL_grant,specifically used for indicating scheduling of the downlink or uplinkphysical data channel resource corresponding to the UE on the componentcarrier pair. However, after the carrier aggregation technology isintroduced into the LTE-Advanced system, at the UE side and the networkside, data can be transmitted on a plurality of component carriers orcomponent carrier pairs at the same time, and the scheduling signalingof the data channel corresponding to each component carrier isindependently encoded, so that the resource scheduling signaling on eachcomponent carrier needs a PDCCH.

In a carrier aggregation system, a PDCCH corresponding to a UE may betransmitted on each component carrier, so as to schedule transmission ofa PDSCH of the UE on the component carrier or a PUSCH corresponding tothe component carrier. Alternatively, the PDCCH of the UE may betransmitted on one or more component carriers. At this time, the PDCCHcan not only indicate transmission of a data channel on a downlinkcomponent carrier on which the PDCCH is and a corresponding uplinkcomponent carrier, but also may further indicate transmission of a datachannel on a downlink component carrier different from that of the PDCCHor a component carrier that is not correspondingly uplink paired.

For a UE, when PDCCHs corresponding to multiple component carriers aretransmitted on a component carrier or a few component carriers, as asearch space corresponding to a control channel has a limited size, theprobability of collisions between the control channels is high, whichmay result in that a part of the PDCCHs of the UE cannot be scheduled,so that a part of the data of the UE cannot be transmitted, and thethroughput of the UE is reduced.

SUMMARY OF THE INVENTION

Embodiments of the present disclosure provide a method for mapping acontrol channel, a method for detecting a control channel and devicesthereof, so as to reduce the probability of collisions between thecontrol channels.

An embodiment of the present disclosure provides a method for mapping acontrol channel, where the method includes:

for the same aggregation level, according to a signaling length of acontrol channel corresponding to a component carrier, determining acorresponding search space for at least two control channels that havethe same signaling length, so as to enable the at least two controlchannels that have the same signaling length to use the same searchspace, and mapping the at least two control channels that have the samesignaling length to the determined corresponding search space; and

for the same aggregation level, according to a signaling length of acontrol channel corresponding to a component carrier, determiningcorresponding search spaces for at least two control channels that havedifferent signaling lengths respectively, so as to enable the at leasttwo control channels that have different signaling lengths to use thedifferent search spaces in at least one time transmission unit, andrespectively mapping the at least two control channels that havedifferent signaling lengths to the determined corresponding searchspaces.

An embodiment of the present disclosure provides a method for detectinga control channel, where the method includes:

for the same aggregation level, according to a signaling length of acontrol channel corresponding to a component carrier, determining acorresponding search space for at least two control channels that havethe same signaling length, so as to enable the at least two controlchannels that have the same signaling length to use the same searchspace, and detecting, in the determined same search space, the controlchannels that have the signaling lengths included in the same searchspace; and

for the same aggregation level, according to a signaling length of acontrol channel corresponding to a component carrier, determiningcorresponding search spaces for at least two control channels that havedifferent signaling lengths respectively, so as to enable the at leasttwo control channels that have different signaling lengths to use thedifferent search spaces in at least one time transmission unit, andrespectively detecting, in the determined different search spaces, thecontrol channels that have the signaling lengths included in thedifferent search spaces.

An embodiment of the present disclosure further provides a transmittingequipment, including:

a first processing module and a second processing module, in which

the first processing module includes: a first search space determinationmodule, configured to, for the same aggregation level, according to asignaling length of a control channel corresponding to a componentcarrier, determine a corresponding search space for at least two controlchannels that have the same signaling length, so as to enable the atleast two control channels that have the same signaling length to usethe same search space; and a first mapping module, configured to map theat least two control channels that have the same signaling length to thecorresponding search space determined by the first search spacedetermination module; and

the second processing module includes: a second search spacedetermination module, configured to, for the same aggregation level,according to a signaling length of a control channel corresponding to acomponent carrier, determine corresponding search spaces for at leasttwo control channels that have different signaling lengths respectively,so as to enable the at least two control channels that have differentsignaling lengths to use the different search spaces in at least onetime transmission unit; and a second mapping module, configured torespectively map the at least two control channels that have differentsignaling lengths to the corresponding search spaces determined by thesecond search space determination module.

An embodiment of the present disclosure further provides a receivingequipment, including:

a first processing module and a second processing module, in which

the first processing module includes: a first search space determinationmodule, configured to, for the same aggregation level, according to asignaling length of a control channel corresponding to a componentcarrier, determine a corresponding search space for at least two controlchannels that have the same signaling length, so as to enable the atleast two control channels that have the same signaling length to usethe same search space; and a first detection module, configured todetect, in the same search space determined by the first search spacedetermination module, the control channels that have the signalinglengths included in the same search space; and

the second processing module includes: a second search spacedetermination module, configured to, for the same aggregation level,according to a signaling length of a control channel corresponding to acomponent carrier, determine corresponding search spaces for at leasttwo control channels that have different signaling lengths respectively,so as to enable the at least two control channels that have differentsignaling lengths to use the different search spaces in at least onetime transmission unit; and a second detection module, configured torespectively detect, in the different search spaces determined by thesecond search space determination module, the control channels that havethe signaling lengths included in the different search spaces.

As can be seen from the description of the foregoing technicalsolutions, in all the embodiments of the present disclosure, searchspaces are flexibly configured, so that for the same aggregation level,corresponding search spaces are determined for at least two controlchannels that have different signaling lengths respectively, and thedetermined search spaces are different in at least one time transmissionunit; as a result, the at least two control channels that have differentsignaling lengths correspond to the different search spaces, theprobability of collisions between the at least two control channels thathave different signaling lengths is reduced, and effective schedulingand transmission of the control channels of a UE are ensured, therebyachieving successful data transmission of the UE and increasing thethroughput of the UE. Optimally, on the other hand, through theembodiments of the present disclosure, the at least two control channelsthat have the same signaling length are enabled to use the same searchspace, so that the flexibility of transmission of the control channelsthat have the same signaling length and are corresponding to differentcomponent carriers is increased, and the probability of collisionsbetween the at least two control channels that have the same signalinglength is reduced.

BRIEF DESCRIPTION OF THE DRAWINGS

To illustrate the technical solutions according to the embodiments ofthe present disclosure or in the prior art more clearly, theaccompanying drawings for describing the embodiments or the prior artare introduced briefly in the following. Apparently, the accompanyingdrawings in the following description are only some embodiments of thepresent disclosure, and persons of ordinary skill in the art can deriveother drawings from the accompanying drawings without creative efforts.

FIG. 1 is a schematic flow chart of a method for mapping a controlchannel according to Embodiment 1 of the present disclosure;

FIG. 2 a is a schematic view of a method for mapping a control channelaccording to Embodiment 2 of the present disclosure;

FIG. 2 b is another schematic view of the method for mapping a controlchannel according to Embodiment 2 of the present disclosure;

FIG. 3 is another schematic view of the method for mapping a controlchannel according to Embodiment 2 of the present disclosure;

FIG. 4 is a schematic view of a method for determining a search spacefor a control channel in the method for mapping a control channelaccording to Embodiment 2 of the present disclosure;

FIG. 5 is a flow chart of a method for detecting a control channelaccording to

Embodiment 3 of the present disclosure;

FIG. 6 is a schematic structural view of a transmitting equipmentaccording to Embodiment 4 of the present disclosure; and

FIG. 7 is a schematic structural view of a receiving equipment accordingto Embodiment 5 of the present disclosure.

DETAILED DESCRIPTION OF THE EMBODIMENTS

In order to make the objectives, technical solutions, and advantages ofthe present disclosure more comprehensible, the present disclosure isdescribed in further detail below with reference to embodiments and theaccompanying drawings. It is obvious that the embodiments to bedescribed are only a part rather than all of the embodiments of thepresent disclosure. All other embodiments obtained by persons skilled inthe art based on the embodiments of the present disclosure withoutcreative efforts shall fall within the protection scope of the presentdisclosure.

A 3GPP E-UTRA system is also referred to as an LTE system. In the LTEsystem, bandwidths variable from 1.4 M (6 RB) to 20 M (100 RB) aresupported, in which the RB is short for a resource block. For any systembandwidth, in each time transmission unit, for example, a subframe, aphysical layer PDCCH occupies a certain resource in both time domain andfrequency domain, and a time frequency resource that the systemallocates to the PDCCH is also variable. For example, the PDCCH occupiesall usable subcarrier resources on the frequency domain. However, on thetime domain, the system flexibly configures a time domain resourceoccupied by the PDCCH by adopting a control format indicator (CFI) valuein a physical control format indicator channel (PCFICH), that is,adopting the number of orthogonal frequency division multiplexing (OFDM)symbols. In the system, 2 bits are adopted to represent three differentcases of the number of the OFDM symbols, for example, three cases inwhich the number of the OFDM symbols is 1, 2, 3 when the systembandwidth is greater than 10 RB, or three cases in which the number ofthe OFDM symbols is 2, 3, 4 when the system bandwidth is smaller than orequal to 10 RB. The time frequency resource (the subcarrier resource,the number of the OFDM symbols) allocated to the PDCCH is divided intomultiple control channel elements (CCEs), and the CCE is a minimum unitof forming a PDCCH time frequency resource. The time frequency resourceoccupied by a PDCCH has 4 aggregation levels, which respectivelycorrespond to 1, 2, 4, and 8 CCEs being occupied, and according to thechannel quality condition of the UE, the system selects a suitableaggregation level (corresponding to a different encoding rate) totransmit the PDCCH of the UE.

In the LTE system, the physical layer PDCCHs of all UEs are shared ineach time transmission unit. The UE performs blind detection in acertain search space for a possibility of any transmission format of thePDCCH through a specific scrambling code of its own, so as to detect allpossible control channel information lengths, an aggregation level andposition of an occupied time frequency resource CCE. In order to reducethe number of times of blind detection performed by the UE in a controlchannel region, a transmission mode adopted by the UE in a period oftime is defined, and a search space is planed. A possible transmissionmode adopted by the UE in a period of time is notified to the UE in asemistatic manner through dedicated signaling. The LTE system has 7downlink transmission modes, each transmission mode correspondinglyrequires detection of two PDCCH formats, and the specific PDCCH formatof the UE is determined in the search space through blind detection. Thesearch space is a time frequency resource on a piece of logic definedaccording to the CCE, and the UE receives control channels and performsblind detection in this space. The search space includes a public searchspace and a UE specific search space, where the public search spacerefers to a search space in which all the UEs that are in a connectedstate and require detection of the PDCCH need blind detection, and theUE specific search space means that only this UE requires PDCCH blinddetection in this specific search space. In the UE specific searchspace, a certain number of CCEs form a search space, which includes 4aggregation levels. It is specified in the protocol that space sizesrespectively corresponding to 4 aggregation levels in total of 1, 2, 4,and 8 CCEs are respectively 6, 6, 2, and 2. Unless the public searchspace is particularly mentioned, the embodiments of the presentdisclosure are mainly directed to the method for mapping and the methodfor detecting control channels in the UE specific search space.

When a system schedules a UE to transmit or receive data, the PDCCH usedfor scheduling indication may be mapped and transmitted at a certain CCEaggregation level in the UE specific search space or the public searchspace. At the same time, the UE needs to perform reception and blinddetection in the possible specific search space or public search spaceof PDCCH mapping and transmission. If the detected signaling data of theUE passes the cyclical redundancy check (CRC), it indicates that thedetected PDCCH is sent to the UE by the system. The UE analyzes thePDCCH according to the signaling format defined in the specification, soas to determine a time frequency resource position of channels throughwhich the UE needs to receive or transmit data. Subsequently, the UEcompletes the data reception and transmission, to realize communicationbetween the UE and the system.

In an LTE-Advanced system, the carrier aggregation technology is usedfor support wider bandwidth, so as to satisfy the requirement of a peakdata rate in the fourth generation communication technology of theInternational Telecommunication Union (ITU). In the carrier aggregation,spectrums of two or more component carriers are aggregated to obtain anLTE-Advanced system having a wider transmission bandwidth. Eachcomponent carrier may be configured to be compatible with the LTEsystem, and the spectrums of all the component carriers may be adjacentconsecutive spectrums, non-adjacent spectrums in the same band, or evennonconsecutive spectrums in different bands. The LTE UE can only beconnected to one pair of compatible component carriers for datareception and transmission, and the LTE-Advanced UE can be connected tomultiple component carriers for data reception and transmission at thesame time according to the capability and service demands. The carrieraggregation technology is also referred to as the spectrum aggregationtechnology, or the bandwidth extension technology.

In the LTE-Advanced system, two or more component carriers are scheduledto one UE at the same time for transmitting uplink or downlink servicesof the UE at the same time. In the carrier aggregation technology, eachcomponent carrier has an independent hybrid automatic repeat request(HARQ) process, and the system may configure the same number ordifferent numbers of component carriers for the LTE-Advanced UE, totransmit data channels or control channels. The PDCCH of the UE can betransmitted on each component carrier, for scheduling a downlink servicechannel PDSCH of the component carrier or a corresponding uplink servicechannel PUSCH of the component carrier, and at this time, the controlchannel PDCCH and the data channel scheduled by the control channelPDCCH may be on the same component carrier. In addition, all the PDCCHsof the UE may also be transmitted on one or more component carriers, forscheduling the PDSCH or PUSCH transmitted on all scheduled uplink ordownlink component carriers of the UE, and at this time, the controlchannel and the data channel scheduled by the control channel may not beon the same component carrier, which is called separation of the controlchannel from the data channel scheduled by the control channel.

In a heterogeneous network system, a carrier interference coordinationmechanism is adopted between component carriers of different systems, ora transmission performance of a control channel is enhanced and acarrier having small interference is selected for bearing the controlchannel, or control signaling coverage among different systems iscoordinated, to avoid frequent switching processes of the UE betweenmultiple component carriers in the same cell. For example, in a homeservice system (Home NodeB), as a small number of UEs are supported, afew control channels are needed, and even one symbol control channelresource in one component carrier can satisfy the demand. Othercomponent carriers may be used for data transmission, so as to increasethe data rate, and at the same time, also coordinate with a macro cellto select a component carrier having small interference to bear acontrol channel. In a coordinated multipoint (CoMP)transmission/reception system, two or more cells or access points areused for transmitting data on different component carriers for the sameUE, but the control channel may be transmitted on merely a part ofcomponent carriers of the service cell. When the LTE-Advanced UE has thedemand of an uplink service higher than that of a downlink service, thenumber of the downlink component carriers configured for the UE may besmaller than that of the uplink component carriers, definitely there isa downlink component carrier transmitting multiple PDCCHs to schedulecorresponding multiple uplink PUSCH channels, thereby preventing the UEfrom receiving data on unnecessary downlink component carriers. When theaggregated component carriers have unequal bandwidths, especially, whena part of the component carrier bandwidths are small, sometimes, thePDCCHs for scheduling data on the component carrier are limited, whilethe remaining resource of the data channel still exists, and the PDCCHfor scheduling transmission of the small bandwidth carrier data can betransmitted on other carriers.

The embodiments of the present disclosure are illustrated by taking theLTE-Advanced system as an example, but the present disclosure is notlimited to the LTE-Advanced system, and the present disclosure is alsoapplicable to other systems, such as a wideband code division multipleaccess (WCDMA) system, or an LTE system.

As shown in FIG. 1, which is a schematic flow chart of a method formapping a control channel according to Embodiment 1 of the presentdisclosure. The method includes the following steps.

In step 11, for the same aggregation level, according to a signalinglength of a control channel corresponding to a component carrier, acorresponding search space is determined for at least two controlchannels that have the same signaling length, so as to enable the atleast two control channels that have the same signaling length to usethe same search space.

In step 12, the at least two control channels that have the samesignaling length are mapped to the determined corresponding searchspace.

A transmitting equipment maps the control channels to the search spacedetermined according to the signaling lengths, and the transmittingequipment is, for example, a network equipment, such as a base stationat the network side.

In this embodiment, after step 12, the method may further include thestep of transmitting the control channels mapped to the search space.

The enabling the at least two control channels that have the samesignaling length to use the same search space includes: enabling the atleast two control channels that have the same signaling length and arecorresponding to different component carriers to use the same searchspace; or enabling the at least two control channels that have the samesignaling length and are corresponding to the same component carrier touse the same search space.

Steps 11 and 12 are about the method in the case that the at least twocontrol channels that have the same signaling length exist in one ormore component carriers, and when at least two control channels thathave different signaling lengths exist in one or more componentcarriers, steps 11 and 12 may also be the following steps or performedtogether with the following steps.

For the same aggregation level, according to a signaling length of acontrol channel corresponding to a component carrier, correspondingsearch spaces are determined for at least two control channels that havedifferent signaling lengths respectively, so as to enable the at leasttwo control channels that have different signaling lengths to use thedifferent search spaces in at least one time transmission unit.

The at least two control channels that have different signaling lengthsare respectively mapped to the corresponding search spaces determined.

The determining the corresponding search spaces for the at least twocontrol channels that have different signaling lengths respectively, soas to enable the at least two control channels that have differentsignaling lengths to use the different search spaces in the at least onetime transmission unit includes: determining corresponding search spacesrespectively for at least two control channels that have differentsignaling lengths and are corresponding to different component carriers,so as to enable the at least two control channels that have differentsignaling lengths to use the different search spaces in at least onetime transmission unit; or determining corresponding search spacesrespectively for at least two control channels that have differentsignaling lengths and are corresponding to the same component carrier,so as to enable the at least two control channels that have differentsignaling lengths to use the different search spaces in at least onetime transmission unit.

In practical applications, mapping rules of the corresponding searchspaces of the control channels corresponding to the component carriersneed to be specified before the receiving and transmitting ends send thecontrol channels to each other, including: which control channels thathave the same signaling length and are corresponding to which carriersuse the same search space, and/or search spaces need to be respectivelydetermined for which control channels that have different signalinglengths and are corresponding to which carriers. In addition, before themapping rules of the corresponding search spaces of the control channelscorresponding to the component carriers are specified, in order torealize transmission and detection of the control channels at thereceiving and transmitting ends, an initial or a default mapping rule,and a position and a size of a search space corresponding to a certainor some control channels corresponding to the component carriers mayalso be included. The method for determining the mapping rules of thecorresponding search spaces of the control channels corresponding to thecomponent carriers may be specified in the standard protocol, explicitlyobtained by the receiving and transmitting sides through algorithms inthe standard protocol, or notified to the receiving equipment by thetransmitting end through dedicated signaling, including high layersemistatic signaling, physical layer dynamic signaling, and a mediaaccess layer control channel.

During the determination of the corresponding search spaces for the atleast two control channels that have different signaling lengthsrespectively, the corresponding search spaces for the two controlchannels that have different signaling lengths are respectivelydetermined, that is, the search spaces are independent and have nodependence relationships or rules. The corresponding search spaces forthe two control channels that have different signaling lengths may berespectively determined according to different signaling lengthidentifiers (IDs) corresponding to the two different signaling lengths,or respectively determined according to component carrier IDscorresponding to the two control channels that have different signalinglengths, or determined by any one or a combination of the foregoingcorrelative quantities, and the present disclosure does not limit theselection of the specific ID parameters. For example, the componentcarrier A has three corresponding signaling lengths a, b, and c, and thecomponent carrier B has four corresponding signaling lengths a, b, d,and e. The control channels that have the signaling length a are enabledto use the same search space, search spaces corresponding to controlchannels that have the signaling lengths c and d are respectivelydetermined, and the determination of the search spaces corresponding tothe control channels that have the two signaling lengths c and d isindependent. For example, the search spaces are respectively determinedaccording to different signaling length IDs corresponding to thesignaling lengths c and d, or respectively determined according to acarrier ID corresponding to the component carrier A having the signalinglength c and a carrier ID corresponding to the component carrier Bhaving the signaling length d, or determined by a combination of theabove two correlative quantities, and the present disclosure does notlimit the selection of the specific ID parameters. The determinationresult is that, the search spaces corresponding to the control channelsthat have the two different signaling lengths may be the same ordifferent, which depends on the randomization of the parameter fordetermining the search spaces acting on the method for determining thesearch spaces, or is determined by other independent determinationmethods. In addition, the present disclosure may not limit the searchspaces corresponding to the control channels that have the othersignaling length b and are corresponding to the component carrier A andthat have the other signaling lengths b and e and are corresponding tothe component carrier B.

Preferably, if the control channels that have the same signaling lengthuse the same search space, the UE performs blind detection once in thesearch space to confirm whether the search space corresponds to acertain control channel among all the control channels that have thesame signaling length, thereby reducing the number of times of blinddetection and decreasing the detection complexity. In addition, the sizeof the search space, that is, the number of included CCEs, is setrelatively flexibly, and the search space is reduced as much as possibleas long as the probability of conflicts between the control channels issatisfied, so as to further decrease the number of times of blinddetection. For example, the component carrier A has three correspondingsignaling lengths a, b, and c, the component carrier B has fourcorresponding signaling length formats a, b, d, and e, and the componentcarrier C has two corresponding signaling lengths a and f, so thecontrol channels that have the signaling length a and are correspondingto the component carrier A, the control channels that have the signalinglength a and are corresponding to the component carrier B, and thecontrol channels that have the signaling length a and are correspondingto the component carrier C are enabled to use the same search space, andmeanwhile the control channels that have the signaling length b and arecorresponding to the component carrier A and the control channels thathave the signaling length b and are corresponding to the componentcarrier B are also enabled to use the same search space.

Preferably, corresponding search spaces are respectively determined forcontrol channels that have different signaling lengths, so that thesearch spaces corresponding to the control channels that have thedifferent signaling lengths may be different, thereby reducing theprobability of collisions between the control channels that have thedifferent signaling lengths, which ensures that the control channels ofthe UE can be effectively scheduled and transmitted, so as to achievesuccessful data transmission of the UE and increase the throughput ofthe UE. Compared with the case that the control channels that have thedifferent signaling lengths also have the same search space, the methodof determining the search space corresponding to the control channelthat has each signaling length independently enables the control channelthat has each signaling length to obtain its own corresponding searchspace, and when the search spaces are not overlapped and the sizes arethe same as those in the contrast schemes, the probability of collisionsbetween the control channels is reduced, and at the same time the numberof times of blind detection is not increased, as only the controlchannels that have the corresponding signaling length need to bedetected in the search space and are corresponding to the controlchannel that has each signaling length. For example, the componentcarrier A has two corresponding signaling lengths a and c, the componentcarrier B has two corresponding signaling length formats a and b, andthe component carrier C has one corresponding signaling length d, so thesearch spaces corresponding to the control channels that have thesignaling length c and are corresponding to the component carrier A, thesearch spaces corresponding to the control channels that have thesignaling length b and are corresponding to the component carrier B, andthe search spaces corresponding to the control channels that have thesignaling length d and are corresponding to the component carrier C arerespectively determined.

Preferably, the method of determining the search space corresponding tothe control channel may further include the following step. The controlchannels that have the same signaling length and are corresponding toone component carrier use the same search space, or the search spacescorresponding to the control channels that have the different signalinglengths and are corresponding to one component carrier are respectivelydetermined. In the case that the control channels that have the samesignaling length and are corresponding to one component carrier use thesame search space, the UE performs blind detection once in the samesearch space to confirm that whether the search space corresponds to acertain control channel among all the control channels that have thesame signaling length, so as to reduce the number of times of blinddetection and decrease the detection complexity. In addition, comparedwith the case that the control channels that have the differentsignaling lengths and are corresponding to one component carrier alsohave the same search space, in the embodiments of the presentdisclosure, the method for determining the search space corresponding tothe control channel that has each signaling length independently enableseach signaling length to have its own corresponding search space, andwhen the search spaces are not overlapped and the sizes are the same asthose in the contrast schemes, the probability of collisions between thecontrol channels is reduced, and at the same time the number of times ofblind detection is not increased, as only the control channels that havethe corresponding signaling lengths need to be detected in the searchspace determined by the UE. For example, the component carrier A has twocorresponding signaling lengths a and b, so the search spacescorresponding to the control channels that have the signaling lengths aand b and are corresponding to the component carrier A are respectivelyand independently determined, and the determination results may be thesame or different, which depends on the randomization of the parameterfor determining the search spaces acting on the method for determiningthe search spaces.

In specific implementation, for the control channels that have the samesignaling length and are corresponding to one component carrier, forexample, Format 0 and Format 1A having the same signaling length, thetwo formats may respectively include 1-bit information, for explicitlyindicating whether the control channel is in Format 0 or Format 1A. Ifthe control channels that have the same signaling length are fromdifferent component carriers, the carrier indication information in thecontrol channel can be multiplexed to differentiate which carrier isindicated, so that the detected control channel may correspond tocomponent carriers scheduled by the control channel, the carrierindication information may be represented by a dominant bit ordifferentiated by adopting a scrambling code, and the specific method isnot limited in the present disclosure. The method of adding bitindication can still be adopted for differentiating the specific formatsof the control channels that have the same signaling length and arecorresponding to one component carrier.

Furthermore, the method of determining the corresponding search spacefor the at least two control channels that have the same signalinglength or the method of determining the corresponding search spaces forthe at least two control channels that have different signaling lengthsmay respectively include the following examples.

In a first example, a start position and a size of the search spacecorresponding to the control channel are determined.

For example, according to a signaling length ID or a signaling lengthgroup ID, the start position of the search space corresponding to thecontrol channel is determined; or according to randomly one or more of:a signaling length ID or a signaling length group ID, and a UE ID, acontrol channel format ID, space division, a component carrier IDcorresponding to the control channel, a subframe number or anaggregation level, the start position of the search space correspondingto the control channel is determined. In the embodiments of the presentdisclosure, the determination of the size of the search space mayinclude the following steps. The size of the search space correspondingto the control channel that has the signaling length is determinedaccording to a signaling notification mode, which may change accordingto dynamic notification of signaling; or, the size of the search spacecorresponding to the control channel that has the signaling length isdetermined according to the number of control channels that have acertain signaling length, which may be determined in a mode defined by astandard protocol, for example, the size of the search space isdetermined according to the number of the control channels that have thecurrent signaling length; or, the size of the search space correspondingto the control channel that has the signaling length is determinedaccording to a specified algorithm; or, the size of the correspondingsearch space of the control channel that has the signaling length at thesame aggregation level is determined according to sizes of search spacescorresponding to all aggregation levels in the existing LTE system. Whenone search space is distributed on one component carrier, the startposition of the search space may be a start number of the CCE includedin the search space, and the size of the search space may be the numberof the CCEs included in the search space. When the CCEs included in thesearch space are consecutive, the search space may be directlydetermined according to the start position and the size. When the CCEsincluded in the search space are nonconsecutive, the search space isdetermined further according to a nonconsecutive rule in addition to thestart position and the size. The nonconsecutive rule may be, forexample, the CCE numbers are odd numbers, even numbers, numbers at aninterval of n or in other regular nonconsecutive forms. When one searchspace is distributed on multiple component carriers, the start positionand size of the search space included on each component carrier arerespectively determined, that is, the corresponding start number of theCCE and the number of the CCEs on each component carrier, and then theCCEs are added to obtain the complete search space distributed on themultiple component carriers.

In a second example, according to an initial search space correspondingto the control channel that has the signaling length, the search spacecorresponding to the control channel that has the signaling length isdetermined.

In the second example, an initial search space corresponding to thecontrol channel that has the signaling length needs to be determinedfirst, and in one case, the initial search space corresponding to thecontrol channel that has the signaling length may be obtained throughthe following steps.

The initial search space corresponding to each component carrier isdetermined, and the initial search space corresponding to the controlchannel that has each signaling length and is corresponding to the samecomponent carrier is the initial search space of the same componentcarrier.

At this time, a start position of an initial search space correspondingto each component carrier may be determined according to randomly one ormore of: a UE ID, space division, a component carrier ID, a subframenumber or an aggregation level. In the embodiments of the presentdisclosure, the determination of the size of the initial search spacemay include the following steps. The size of the initial search spacecorresponding to the component carrier is determined according to asignaling notification mode, which may change according to dynamicnotification of signaling; or, the size of the initial search spacecorresponding to the component carrier is determined according to thenumber of control channels corresponding to the component carrier, whichmay be determined in a mode defined by a standard protocol, for example,the size of the initial search space is determined according to thenumber of the control channels corresponding to the current componentcarrier; or, the size of the initial search space corresponding to thecomponent carrier is determined according to a specified algorithm; or,the corresponding size of the initial search space of the controlchannel that has the signaling length at the same aggregation level isdetermined according to the sizes of search spaces corresponding to allaggregation levels in the existing LTE system. For example, the initialsearch space corresponding to the component carrier is configuredaccording to parameters such as the number of control channelscorresponding to the component carrier and/or the aggregation level, ordetermined according to an algorithm specified in a standard protocol.Typically, for each aggregation level, the initial search spacecorresponding to the control channel that has the signaling length andis corresponding to each component carrier is the same as the searchspace in the existing LTE system. Definitely, compared with the searchspace in the LTE system, an initial search space of a control channelthat has a signaling length and is corresponding to a specific componentcarrier, for example, a main carrier, may also be larger, and initialsearch spaces corresponding to carriers other than the main carrier aresmaller than the search space of the LTE system; other possibleconfigurations may also be applicable, which depends on the demands ofthe system, and the present disclosure is not limited in this aspect.

In another case, the initial search space corresponding to the controlchannel that has the signaling length may be obtained through thefollowing steps.

In step 1, the initial search space corresponding to the control channelthat has each signaling length and is corresponding to each componentcarrier is determined.

In step 2, if at least two same signaling lengths exist in the signalinglengths corresponding to the same component carrier, the controlchannels that have the at least two same signaling lengths are enabledto use the same initial search space; and/or, if at least two differentsignaling lengths exist in the signaling lengths corresponding to thesame component carrier, the control channels that have the at least twodifferent signaling lengths are enabled to use different initial searchspaces in at least one time transmission unit.

At this time, according to a signaling length ID or a signaling lengthgroup ID, a start position of an initial search space corresponding to acontrol channel that has each signaling length and is corresponding toeach component carrier is determined; or according to randomly one ormore of: a signaling length ID or a signaling length group ID, and a UEID, a control channel format ID, space division, a component carrier IDcorresponding to the control channel, a subframe number or anaggregation level, a start position of an initial search spacecorresponding to a control channel that has each signaling length and iscorresponding to each component carrier can be determined. In theembodiments of the present disclosure, the determination of the size ofthe initial search space may include the following steps. The size ofthe initial search space corresponding to the control channel that hasthe signaling length is determined according to a signaling notificationmode, which may change according to dynamic notification of signaling;or, the size of the initial search space corresponding to the controlchannel that has the signaling length is determined according to thenumber of control channels that have a certain signaling length in amode defined in a standard protocol, for example, the size of theinitial search space is determined according to the number of thecontrol channels that have the current signaling length; or, the size ofthe initial search space corresponding to the control channel that hasthe signaling length is determined according to a specified algorithm;or, the size of the corresponding initial search space of the controlchannel that has the signaling length at the same aggregation level isdetermined according to sizes of search spaces corresponding to allaggregation levels in the existing LTE system.

In still another case, furthermore, if a large number of componentcarriers are scheduled by the UE, or as single user multiple-inputmultiple-output (SU-MIMO), multi-antenna transmission, consecutive andnonconsecutive resource allocation are supported, the UE may supportcontrol channels that have various signaling lengths in each subframe.At this time, during determination of a search space corresponding to acontrol channel according to signaling lengths of control channelscorresponding to component carriers, the component carriers may furtherbe grouped, and after the component carriers are grouped, the initialsearch space corresponding to the control channel that has the signalinglength may be further obtained through the following steps.

An initial search space corresponding to each component carrier group isdetermined, and the initial search space corresponding to the controlchannel that has each signaling length and is corresponding to the samecomponent carrier group is the initial search space of the samecomponent carrier group.

At this time, a start position of an initial search space correspondingto each component carrier group may be determined according to randomlyone or more of: a UE ID, space division, a component carrier group ID, asubframe number or an aggregation level.

The method for grouping the component carriers may include the followingsteps. Each pair of uplink and downlink component carriers are dividedinto a group; or component carriers having the same transmission modeare divided into a group; or component carriers having the sametransmission bandwidth are divided into a group; or component carriershaving the same number of transmit antennas are divided into a group; ora random combination of the above methods can be used. The presentdisclosure does not limit the specific grouping method.

In a second example, after the initial search space corresponding to thecontrol channel that has the signaling length is determined, thespecific method for determining the search space corresponding to thecontrol channel that has the signaling length according to the initialsearch space includes the following steps.

If one signaling length of a control channel corresponding to onecomponent carrier is different from one signaling length of a controlchannel corresponding to another one or more component carriers, thesearch space corresponding to the control channel that has one signalinglength and is corresponding to the one component carrier and the anotherone or more component carriers is completely or partially the same asthe initial search space corresponding to the control channel that hasthe one signaling length. The search space corresponding to the controlchannel that has the one signaling length and the initial search spacecorresponding to the control channel that has the one signaling lengthbeing partially the same means that: The search space corresponding tothe control channel that has the one signaling length is a certainsubset of the initial search space corresponding to the control channelthat has the signaling length, or the CCEs are increased or reducedaccording to the subset; and/or

If one signaling length of the control channel corresponding to onecomponent carrier is the same as one signaling length of the controlchannel corresponding to another one or more component carriers, thesearch space corresponding to the control channel that has one signalinglength and is corresponding to the one component carrier and the anotherone or more component carriers is all or a part of a search space formedby the initial search space corresponding to the control channel thathas the one signaling length and is corresponding to the one componentcarrier and the initial search space corresponding to the controlchannel that has the one signaling length and is corresponding to theanother one or more component carriers. The search space correspondingto the control channel that has the one signaling length being a part ofthe search space formed by the initial search spaces corresponding tothe control channels that have the signaling lengths means that: Thesearch space corresponding to the control channel that has the onesignaling length is a certain subset of all the initial search spacescorresponding to the control channels that have the signaling length, orthe CCEs are increased or reduced according to the subset.

The method for specifying the search space corresponding to the controlchannel that has the signaling length according to the initial searchspace corresponding to the control channel that has the signaling lengthafter grouping can be acquired in a similar manner.

In this embodiment, for the same aggregation level, a transmittingequipment may determine a search space corresponding to a controlchannel according to a signaling length of the control channel, whichfacilitates the design of the search space, reduces the number of timesof blind detection, and alleviates the conflicts between the controlchannels, thereby reducing the probability of collisions between thecontrol channels.

The specific analysis is as follows. For example, when control channelscorresponding to any one or more component carriers include the samesignaling length, the control channels that have the same signalinglength may use the same search space, and when the UE performs blinddetection on the search spaces included at an aggregation level, thatis, the CCE resource, it can be determined whether a certain controlchannel has the signaling length through detection once. At this time,the control channels that have the signaling length may flexibly use thesearch space of the control channels that have the same signalinglength, and the control channels can be flexibly mapped to the spacewithout increasing the number of times of blind detection, but thelimits of transmission of the control channels are reduced, therebycorrespondingly reducing the probability of collisions between thecontrol channels. When the signaling lengths of two control channels arethe same, the following cases are included. The two control channelshave the same format corresponding to the same component carrier.Alternatively, the two control channels have different formatscorresponding to the same component carrier, for example, the samecomponent carrier has different formats: Format 0 and Format 1A, but hasthe same signaling length. Alternatively, the two control channels havethe same format corresponding to different component carriers having thesame bandwidth. Alternatively, the two control channels have differentformats corresponding to different component carriers having the samebandwidth. Alternatively, the two control channels have the same formatcorresponding to different component carriers having the same number ofantennas. Alternatively, the two control channels have different formatscorresponding to different component carriers having the same number ofantennas. Or, even some additional processing is performed on the twocontrol channels, for example, a padding bit is added, or an indicationbit of some information is reduced (such as increasing the granularityof resource allocation), to reduce a bit number used for resourceallocation, thereby enabling the two control channels that have the sameformat or different formats to have the same signaling length. Thesignaling length of the control channel is a major factor thatinfluences the number of times of blind detection, and the reason isthat, the receiving equipment needs to perform blind detection oncorresponding various signaling lengths that may occur in the searchspace at a possible aggregation level in the search space, and when thecontrol channels that have the same signaling length use the same searchspace, the UE performs blind detection in the search space once todetermine whether the search space corresponds to a certain controlchannel among all the control channels that have the same signalinglength, thereby reducing the number of times of blind detection anddecreasing the detection complexity.

When signaling lengths of control channels corresponding to any one ormore component carriers are different, search spaces corresponding tothe control channels that have different signaling lengths arerespectively determined, and at this time, the search spacescorresponding to the control channels that have the different signalinglengths may be different. When the search spaces are not overlapped andhave the same sizes as those of the control channels that have thedifferent signaling lengths, the control channels that have thecorresponding signaling length only need to be detected in the searchspace corresponding to the control channel that has each signalinglength, thereby reducing the probability of collisions between thecontrol channels without increasing the number of times of blinddetection. Therefore, the probability of collisions between the controlchannels that have different signaling lengths is reduced, and it isensured that the control channels of the UE can be effectively scheduledand transmitted, thereby achieving successful data transmission of theUE and increasing the throughput of the UE without adding the number oftimes of blind detection.

FIG. 2 a is a schematic view of a method for mapping a control channelaccording to Embodiment 2 of the present disclosure, and FIG. 2 b isanother schematic view of the method for mapping a control channelaccording to Embodiment 2 of the present disclosure. As shown in FIG. 2a, search spaces corresponding to control channels that have varioussignaling lengths and are corresponding to one component carrier aremapped onto one component carrier, and as shown in FIG. 2 b, searchspaces corresponding to control channels that have various signalinglengths and are corresponding to multiple component carriers are mappedonto one component carrier. On the basis of the method for mapping acontrol channel according to Embodiment 1 of the present disclosure, thecontrol channel may be, for example, a PDCCH, and the PDCCH is taken asan example for illustration in this embodiment and the followingembodiments, but the present disclosure is not limited to the PDCCH.

In this embodiment, one component carrier may correspond to N signalinglengths of the PDCCH, and the PDCCHs having the N signaling lengthsperform data transmission on one or more component carrierscorresponding to the UE.

As shown in FIG. 2 a, when a transmitting equipment determines to enableone UE to correspond to control channels that have N signaling lengthson one component carrier, for the same aggregation level, at least twocontrol channels that have the same signaling length and arecorresponding to the same component carrier are enabled to use the samesearch space; and/or, corresponding search spaces are determinedrespectively for at least two control channels that have differentsignaling lengths and are corresponding to the same component carrier,so as to enable the at least two control channels that have differentsignaling lengths to use the different search spaces in at least onetime transmission unit. For example, search spaces of PDCCHs that have Nsignaling lengths and are corresponding to one component carrier areindependently determined respectively. For a UE3, it is assumed that theUE3 corresponds to three signaling lengths of the PDCCH on one componentcarrier: N=3, corresponding to data transmission of one componentcarrier pair A (uplink and downlink component carriers A). Thetransmitting equipment may allocate one search space to a PDCCH that haseach signaling length and is corresponding to data transmission of onecomponent carrier pair A within a control channel region 20 on thedownlink component carrier A, and three search spaces in total areallocated: a search space 21, a search space 22, and a search space 23,in which PDCCHs having one signaling length can be merely borne withineach search space.

As shown in FIG. 2 b, when the transmitting equipment determines thatcontrol channels that have various signaling lengths and arecorresponding to multiple component carriers of one UE are mapped ontoone component carrier, for the same aggregation level, a correspondingsearch space is determined for at least two control channels that havethe same signaling length and are corresponding to different componentcarriers, so as to enable the at least two control channels that havethe same signaling length to use the same search space; and/or,corresponding search spaces are respectively determined for at least twocontrol channels that have different signaling lengths and arecorresponding to different component carriers, so as to enable the atleast two control channels that have different signaling lengths to usethe different search spaces in at least one time transmission unit. Forexample, the transmitting equipment configures that the service data ofthe UE3 can be borne on the component carrier pairs A and B fortransmission, and the transmitting equipment configures that all controlchannels PDCCHs of the UE3 are transmitted on the downlink componentcarrier A, that is to say, the scheduling of the PDCCHs corresponding tothe data of the UE3 on both the downlink component carrier A and thedownlink component carrier B is borne by the downlink component carrierA. For each PDCCH aggregation level, the transmitting equipment mayallocate a search space to a control channel that has each signalinglength within the control channel region 20 on the downlink carrier A.It is assumed that N=2, two signaling lengths X and Y of the PDCCH existon one downlink component carrier A, and one signaling length X of thePDCCH exists on the downlink component carrier B, so the downlinkcomponent carrier A and the downlink component carrier B have the samesignaling length X. In FIG. 2 b, one search space 24 is allocated toPDCCHs having the same signaling length X on the two carriers, andanother search space 25 is allocated to a PDCCH having another signalinglength Y different from X on the downlink component carrier A. Inconclusion, search spaces, including, for example, the search space 24and the search space 25, can be allocated to PDCCHs that have signalinglengths and are corresponding to multiple component carriers. The CCEnumbers included in the two search spaces may be completely different,or partially the same, or even completely the same, and thesedifferences influence the probability of PDCCH collisions of the UE andthe PDCCH formats or signaling lengths to be detected in thecorresponding search space of the UE. For example, reference can be madeto related examples of the method for mapping a control channelaccording to Embodiment 1 of the present disclosure.

Extensionally, FIG. 3 is another schematic view of the method formapping a control channel according to Embodiment 2 of the presentdisclosure. As shown in FIG. 3, when the transmitting equipmentdetermines to enable one UE to correspond to N signaling lengths of thePDCCH on P component carriers, in one case, N search spaces areallocated to the UE based on each aggregation level within all controlchannel regions of the P component carriers, so that the PDCCH havingeach signaling length is borne within its corresponding search space. Inanother case, when N signaling lengths of the PDCCH are borne on the Pcomponent carriers for one UE, M (M<N) search spaces can be allocated tothe UE based on each aggregation level within all control channelregions of the P component carriers, and at this time the at least twocontrol channels that have different signaling length correspond to onesame search space. In FIG. 3, P=2, N=3, the transmitting equipmentconfigures that service data of a UE4 can be borne on paired uplink anddownlink component carriers A, B, and C for transmission, thetransmitting equipment also configures that the control channel PDCCH ofthe UE4 can be transmitted on the downlink component carrier A and thedownlink component carrier B, and it is assumed that the scheduledsignaling lengths of the PDCCH of the UE4 include signaling lengths X,Y, and Z. For each PDCCH aggregation level, the transmitting equipmentmay allocate three search spaces in total on the downlink componentcarrier A and the downlink component carrier B, and each search spaceonly bears a control channel that has a signaling length of the PDCCH,and the number of CCEs included in each search space may be reconfiguredby the transmitting equipment as requires. Two search spaces, that is, asearch space 31 and a search space 32 corresponding to the signalinglengths X and Y of the PDCCH may be configured in a control channelregion 30 of the downlink component carrier A, and a search space 33having the signaling length Z of the PDCCH may be configured in acontrol channel region 34 of the downlink component carrier B. The CCEnumbers included in the search spaces 31 and 32 may be the same orcompletely different. In addition to this method, the search spacehaving the signaling length Z of the PDCCH may also correspond to thesearch space 31 in the control channel region 30 of the downlinkcomponent carrier A, so that the search space having the signalinglength Z of the PDCCH can be distributed on multiple component carriers,and the foregoing example not only includes the search space 31 in thecontrol channel region 30 of the downlink component carrier A, but alsoincludes the search space 33 in the control channel region 34 of thedownlink component carrier B. In conclusion, all CCEs of one searchspace may be distributed on one component carrier, and may also bedistributed on multiple component carriers.

In view of the above, for an aggregation level, search spacescorresponding to control channels that have various signaling lengthsmay be distributed on one component carrier or distributed on multiplecomponent carriers, and the CCE numbers in the search spaces may beconsecutive or nonconsecutive. When the search spaces corresponding tothe control channels that have the signaling lengths of the PDCCH aredistributed within one component carrier, start CCE numbers and allincluded CCE numbers of the search spaces on the component carrier areobtained, so as to obtain the search spaces corresponding to the controlchannels that have the signaling lengths of the PDCCH. When the searchspaces corresponding to the PDCCHs having the signaling lengths of thePDCCH are distributed in multiple component carriers, the CCE numbersincluded in the search spaces corresponding to each component carrierare obtained, and the CCEs are added to obtain the search spacescorresponding to the PDCCHs having the signaling lengths of the PDCCH.If the CCE numbers in the corresponding search spaces on one componentcarrier are consecutive, according to the start CCE number of thedetermined search space and the number of the CCEs included in thesearch space, all the CCE numbers included in the search space can beacquired.

In this embodiment, the determining the search space corresponding tothe PDCCH having a certain signaling length may include the followingexamples.

In a first example, a start position and a size of a search spacecorresponding to a PDCCH having a certain signaling length aredetermined.

The start position of the search space corresponding to the controlchannel is determined according to a signaling length ID or a signalinglength group ID; or the start position of the search space correspondingto the control channel is determined according to randomly one or moreof: a signaling length ID or a signaling length group ID, and a UE ID, acontrol channel format ID, space division, a component carrier IDcorresponding to the control channel, a subframe number or anaggregation level. The signaling length ID and the signaling lengthgroup ID may be a system specific signaling length ID, that is, anabsolute signaling length ID, or a UE specific signaling length ID, thatis, a relative signaling length ID; and the component carrier IDcorresponding to the control channel may also be a system specificcomponent carrier ID, that is, an absolute component carrier ID, or a UEspecific component carrier ID, that is, a relative component carrier ID.

The start position of the search space, that is, the CCE number at thestart position, can be determined, for example, through calculationaccording to the UE ID. As the same UE may correspond to different UEIDs on different component carriers, the start position of the searchspace can be calculated using the UE ID, so that the start positions ofsearch spaces of different component carriers on the same aggregationlevel are different. A start position of a search space corresponding toa control channel in a subframe k of one UE is calculated using a UE ID,for example, calculated through the following formulas (1) and (2):

Y _(k)=(A×Y _(k−1))modD   (1)

Z _(k) =L×[Y _(k)mod└N _(cce,k) ÷L┘]  (2).

In the above formulas (1) and (2), A may be, for example, 39827; D maybe, for example, 65537; an iterative value Y_(k) may be regarded as aniterative value that changes with a subframe number k, and when k=0, Y⁻¹is an iterative initial value, in which the iterative initial value isgenerally a UE ID allocated to the UE by the system or referred to as acell radio network temporary identifier (C-RNTI) equal to n_(RNTI) andthe iterative initial value is not 0; L is an aggregation level;N_(CCE,k) is the total number of CCEs for controlling channeltransmission of the system in the k^(th) subframe; the iterative valueY_(k) of the current subframe is obtained by taking the modulus of aproduct of an iterative value Y_(k−1) of a previous subframe multipliedby a constant A with respect to D, so that the iterative value Y_(k) ofthe current subframe is a result obtained through an iterative operationwith iterative values of the previous (K−1) subframes; mod representsthe operation of taking the modulus; and Z_(k) represents the startposition of the search space corresponding to the control channel if thesystem allocates a control channel at an aggregation level L to a UEwith the UE ID n_(RNTI) in the k^(th) subframe.

The transmitting equipment allocates different UE IDs to different UEs,the UE IDs are not only used for identifying different UEs in the samecell, but also have a function of randomizing a start position of asearch space during the calculation of the search space of the UE. Therandomization method may also randomize distribution of search spacescorresponding to the control channels between the UEs to a certaindegree, so as to reduce collisions of the control channels between theUEs.

In addition to the determination of the start CCE number of the searchspace through calculation by using the UE ID, the number of the CCE atthe start position of the search space may also be determined togetherwith the signaling length ID, and for example, the signaling length ofthe PDCCH supported by the UE in the current subframe can be identified.As different UEs support different numbers of signaling lengths of thePDCCH, the ID adopted for the same signaling length of the PDCCH mayalso be different, which has a UE specific characteristic and is arelative signaling length ID adopted by the UE. Definitely, all thesignaling lengths of the PDCCH supported in the system may also beabsolutely identified, in which the signaling length IDs of the PDCCHcorresponding to the signaling lengths of the PDCCH of the UE areadopted. The UE specific signaling length ID of the PDCCH is used fordifferentiating the search spaces corresponding to the PDCCHs havingvarious signaling lengths, and different signaling lengths of the PDCCHcorresponding to the same UE have different signaling length IDs of thePDCCH. For example, the start position can be calculated through thefollowing formulas (3) and (4):

Y _(k)=(A×Y _(k−1) ×M _(k,p))modD   (3)

Z _(k) =L×[Y _(k)mod└N _(cce,k) ÷L┘]  (4)

In the above formulas (3) and (4), M_(k,p) is a signaling length ID ofthe PDCCH corresponding to a signaling length of a p^(th) controlchannel in the subframe k, and the M_(k,p) is not 0; the meanings ofother parameters are the same as those in the formulas (1) and (2).

It can be seen from the above two examples that, when a parameterdifferent from the UE ID, for example, a signaling length ID or acomponent carrier ID, is introduced for calculating the start CCE numberof the search space, in theory, it is equivalent to using another UE IDin the current subframe. When the Y_(k) in a certain subframe is equalto the Y_(k) corresponding to the another UE ID with the change of time,as the introduced parameter, for example, the signaling length ID or thecomponent carrier ID, cannot change dynamically with the subframe, forinstance, the component carrier ID corresponding to the UE changes in asemistatic manner, when the Y_(k) corresponding to the two users areequal in a certain subframe, the Y_(k) remain equal in the followingsubframes, so that collisions keep occurring between the controlchannels of the two users. In one solution, the allocation of theanother UE ID that makes the two parameters equivalent is stopped, whichinfluences the method for allocating the UE ID. In another solution,non-multiplication (for example, an additive relationship) is adoptedfor the M_(k,p), so that continuous collisions may not occur in randomchanges of the subframe.

As the number of all the CCEs allocated to the control channel may beinvolved during the determination of the start position of the searchspace by using the signaling length ID of the PDCCH, in this embodiment,all the CCEs allocated to the control channel may be divided, that is,divided in space, to further determine the start position of the searchspace. For example, the number of all the CCEs allocated to the PDCCH is100, so that when the signaling length ID of the PDCCH is used forcalculation, in order to prevent the calculation result from exceedingthe 100 CCEs, the calculation result may be limited within the 100 CCEs,for example, by taking a modulus of the calculation result with respectto 100. Therefore, the start positions of the search spaces obtainedthrough calculation of the signaling length IDs of different PDCCHs maybe the same. In order to further avoid overlapping search spacescorresponding to control channels that have different signaling lengthsof one UE, all the CCEs may be divided into two groups, that is, thewhole search space allocated to the PDCCH is divided into two. In thisway, it is limited that a part of the search space can only be locatedin a first space obtained through division, and the other search spacecan only be located in a second space obtained through division. Inorder to better avoid collisions between the control channels, thesearch space can be divided according to the number or classification ofthe signaling lengths of the PDCCH. For example, if totally N signalinglengths of the PDCCH exist, the whole search space allocated to thecontrol channel is divided into N, so that the search space for eachsignaling length of the PDCCH can only be located in the correspondingdivided space; therefore, the CCEs included in the search spacescorresponding to the PDCCHs having different signaling lengths are notoverlapped, and without changing the number of times of blind detection,the PDCCH mapping regions of multiple signaling lengths corresponding toone UE are different, which reduces collisions between the controlchannels. Definitely, one CCE region may also be allocated to PDCCHshaving multiple signaling lengths, so the CCEs included in the searchspaces corresponding to the PDCCHs having certain signaling lengths areoverlapped. For example, a start position of a search spacecorresponding to a control channel in a subframe k of one UE can becalculated through the following formulas (5) and (6):

Y _(k)=(A*Y _(k−1))mod D   (5)

Z _(k) =L×[Y _(k)mod└(n×N _(cce,k))÷(N×L)┘]  (6)

In the above formulas (5) and (6), N is the number of spaces dividedfrom the whole control channel space; n is a signaling length of an nthcontrol channel, and generally n≦N; the meanings of other parameters arethe same as the formulas (1) and (2).

The size of the search space means the number of CCEs included in thesearch space, which may be fixed or variable. The size of the searchspace corresponding to the control channel that has the signaling lengthis determined according to a signaling notification mode, which, forexample, changes dynamically with signaling; or, the size of the searchspace corresponding to the control channel that has the signaling lengthis determined according to the number of control channels in a modedefined in a standard protocol, for example, the size of the searchspace is determined according to the number of the control channels thathave the current signaling length; or, the size of the search spacecorresponding to the control channel that has the signaling length isdetermined according to a specified algorithm; or, the size of thesearch space corresponding to the control channel that has the signalinglength at the same aggregation level is determined according to sizes ofsearch spaces corresponding to all aggregation levels in the existingLTE system.

In a second example, according to an initial search space correspondingto the control channel that has the signaling length, the search spacecorresponding to the control channel that has the signaling length isdetermined, and reference can be made to the related description inEmbodiment 1 of the present disclosure for the specific cases and steps.For example, FIG. 4 is a schematic view of a method for determining asearch space for a control channel in the method for mapping a controlchannel according to Embodiment 2 of the present disclosure. As shown inFIG. 4, a component carrier pair S includes a downlink component carrierS and a corresponding uplink component carrier S, the component carrierpair S corresponds to signaling lengths A and C, and an initial searchspace corresponding to control channels that have the two signalinglengths A and C corresponds to a region labeled 41 in the downlinkcomponent carrier S (the PDCCH carrier S); a component carrier pair Tincludes a downlink component carrier T and a corresponding uplinkcomponent carrier T, the uplink component carrier T corresponds tosignaling lengths A and B, and an initial search space corresponding tocontrol channels that have the two signaling lengths A and B correspondsto a region labeled 42 in the downlink component carrier T (the PDCCHcarrier T). Both the signaling length C corresponding to the componentcarrier pair S and the signaling length B corresponding to the componentcarrier pair T are unique signaling lengths, so that the search spacescorresponding to the control channel that has the signaling length C andis corresponding to the component carrier pair S and the control channelthat has the signaling length B and is corresponding to the componentcarrier pair T are completely or partially the same to respectivecorresponding initial search spaces, for example, the size of the searchspace corresponding to the control channel that has the signaling lengthC and is corresponding to the component carrier pair S is the initialsearch space 41 of S, and the size of the search space corresponding tothe control channel that has the signaling length B and is correspondingto the component carrier pair T is the initial search space 42 of T. Inaddition, the signaling length A corresponding to the component carrierpair S and the signaling length A corresponding to the component carrierpair T are the same, the search spaces corresponding to the controlchannels that has the signaling length A and is corresponding to thecomponent carrier pair S and the signaling length A corresponding to thecomponent carrier pair T may be the same, and the size of the searchspace may be that: The search space corresponding to the control channelthat has one signaling length A may be a part or all of the initialsearch spaces having the signaling length A corresponding to thecomponent carrier pairs S and T. For example, if all of the initialsearch spaces are adopted, and represented as a universal set of initialsearch spaces corresponding to search spaces corresponding to controlchannels that have the signaling length A and are corresponding to thecomponent carrier pair S and the signaling length A corresponding to thecomponent carrier pair T, that is, the initial search space 41 and theinitial search space 42. In addition, the control channel that has thesignaling length A and is corresponding to the component carrier pair Sbeing a part of the initial search space having the signaling length Acorresponding to the component carrier pair T means that: Included CCEscan be increased or reduced according to the initial search spacecorresponding to a certain subset of the control channels that have thesignaling length A. The method for determining the initial search spacemay have the following cases. In one case, an initial search spacecorresponding to each component carrier is determined, and the initialsearch space corresponding to the control channel that has eachsignaling length and is corresponding to the same component carrier isthe initial search space of the same component carrier. At this time, astart position of the initial search space corresponding to eachcomponent carrier can be determined according to randomly one or moreof: a UE ID, space division, a component carrier ID, a subframe numberor an aggregation level. In another case, an initial search spacecorresponding to the control channel that has each signaling length andis corresponding to each component carrier is determined. If at leasttwo same signaling lengths exist in signaling lengths corresponding tothe same component carrier, the control channels that have the at leasttwo same signaling lengths are enabled to use the same initial searchspace; and/or, if at least two different signaling lengths exist in thesignaling lengths corresponding to the same component carrier, thecontrol channels that have the at least two different signaling lengthsare enabled to use different initial search spaces in at least one timetransmission unit. At this time, according to a signaling length ID or asignaling length group ID, a start position of an initial search spacecorresponding to the control channel that has each signaling length andis corresponding to each component carrier is determined; or accordingto randomly one or more of: a signaling length ID or a signaling lengthgroup ID, and a UE ID, a control channel format ID, space division, acomponent carrier ID corresponding to the control channel, a subframenumber or an aggregation level, a start position of an initial searchspace corresponding to the control channel that has each signalinglength and is corresponding to each component carrier is determined. Instill another case, after the component carriers are grouped, theinitial search space corresponding to each component carrier group isdetermined, and the initial search space corresponding to the controlchannel that has each signaling length and is corresponding to the samecomponent carrier group is the initial search space of the samecomponent carrier group. At this time, according to randomly one or moreof: a UE ID, space division, a component carrier group ID, a subframenumber or an aggregation level, a start position of an initial searchspace corresponding to each component carrier group is determined.Reference can be made to the above formulas (1) to (6) and relateddescription for the specific method of determining the start position ofthe initial search space, and the method can be implemented by merelymodifying related parameters. In addition, reference can be made to therelated description in Embodiment 1 of the present disclosure for themethod for grouping the component carriers.

Furthermore, in this embodiment, for each aggregation level, the CCEsincluded in the search spaces corresponding to the control channelsdetermined according to the signaling lengths of the control channelsmay be nonconsecutive or consecutive, and may be distributed on onecarrier or distributed on multiple carriers. In the case ofnonconsecutive CCEs, a nonconsecutive rule of the CCEs is acquired.

Furthermore, in this embodiment, for each aggregation level, positionrelationships between the determined control channels that havedifferent signaling lengths may be nonconsecutive or consecutive, andmay be completely not overlapped, partially overlapped or completelyoverlapped.

In this embodiment, when the corresponding search spaces of the controlchannels corresponding to the component carriers are determined, theposition relationships between the search spaces can be determinedaccording to the signaling lengths of the control channels, whichincludes the following examples.

In a first example, if the signaling lengths of the control channelscorresponding to different component carriers are the same, it isdetermined that the search spaces corresponding to the componentcarriers having the same signaling length are completely overlapped orpartially overlapped, and the control channel includes carrierindication information for indicating different component carriers.

When the search spaces are completely overlapped, the start positions ofthe search spaces corresponding to the component carriers having thesame signaling length of the corresponding control channel are the same,and the sizes of the search spaces are also the same; while when thesearch spaces are partially overlapped, the search spaces correspondingto the component carriers having the same signaling length of thecorresponding control channel at least include one same CCE. As thesignaling lengths of the control channels corresponding to the componentcarriers having completely overlapped or partially overlapped searchspaces are the same, the overlapping of search spaces can reduce thenumber of times of blind detection to a great extent. For example, whendata transmission modes of a pair of uplink and downlink componentcarriers A and B are the same, the signaling lengths of correspondingPDCCHs for scheduling data transmission on each carrier pair are thesame, and at this time, preferably the CCE numbers included in the twosearch spaces are completely the same; in this case, it can be regardedthat only one search space exists, the PDCCHs corresponding to the twocarriers may be borne at any position within the search space, therebyincreasing the flexibility of placing the control channels, and thenumber of times of blind detection is not increased as the signalinglengths of the PDCCHs for scheduling multiple carriers are the same. Atthis time, each PDCCH requires carrier indication information thatindicates which carrier is scheduled, and the carrier indicationinformation may be implemented through a scrambling code of the carrierspecific information or through a field display indication in the PDCCH.It is assumed that the search space corresponding to each aggregationlevel is M, and if one transmission mode corresponds to two signalinglengths of the PDCCH, in the search space M, the UE needs blinddetection for 2M times. When the search spaces of the control channelsthat have the signaling length and are corresponding to differentcomponent carriers are completely overlapped or partially overlapped,the conflicts between the control channels can be reduced by increasingthe sizes of the search spaces. For example, when the aggregation levelis 8 CCEs and the search space in the existing solution is formed of 16CCEs, in order to reduce the conflicts between the control channels, thesize of the search space corresponding to the control channel that hasthe signaling length may be set greater than 16 CCEs, for example, setto 32 CCEs.

In a second example, if control channels corresponding to differentcomponent carriers have different signaling lengths, it is determinedthat the search spaces corresponding to the component carriers havingthe different signaling lengths are not overlapped.

For example, when the data transmission modes of the uplink and downlinkcomponent carrier pairs A and B are not the same, that is, the signalinglengths of the corresponding PDCCHs for scheduling data transmission oneach component carrier pair may be different, each component carrierpair is configured according to the demands of its own transmissioncharacteristics, and each component carrier pair has several differentsignaling lengths of the PDCCH. At this time, preferably, the CCEnumbers included in the two search spaces are set completely different;in this case, it can be regarded that both the component carrier pairs Aand B have respective independent search spaces corresponding to thecontrol channels that have the carrier signaling lengths, and the PDCCHscorresponding to the two component carrier pairs can only be borne incorresponding search spaces for transmission respectively. Therefore,the PDCCH requires no information for indicating which component carrierpair is scheduled, and the information of the specific search space forthe component carrier pair indicates which component carrier isscheduled, thereby saving the signaling overhead of the PDCCH. It isassumed that one search space corresponding to each aggregation level isM. If a transmission mode corresponds to two signaling lengths of thePDCCH, in the search space M, the UE needs blind detection for M timesin each search space; while in the two search spaces, the UE needs blinddetection for M+M=2M times in total. When the search spaces are notoverlapped, the number of times of blind detection is not reduced;however, the size of the search space can be properly reduced or keptthe same as that of the search space in the LTE system.

When for the same aggregation level, search spaces corresponding tocontrol channels of different component carriers are not overlapped,carrier indication information of the component carrier, for example,identification information or a carrier index, may no longer betransmitted. The reason is that, for the same aggregation level, searchspaces of different component carriers are not overlapped, so that whenthe UE detects a PDCCH in a specific search space, the UE learns thatthe PDCCH corresponds to the component carrier corresponding to thesearch space. When for the same aggregation level, the search spacescorresponding to the control channels of different component carriersare partially overlapped or completely overlapped, component carrieridentification information needs to be transmitted, so that the UElearns which component carrier the PDCCH detected by the UE in thespecific search space corresponds to.

In a third example, it is determined that the search spacescorresponding to the control channels that have the signaling lengthsand are corresponding to the component carriers are partiallyoverlapped.

The method in the first example may be adopted to make the search spacescorresponding to the control channels that have the signaling lengthsand are corresponding to the component carriers only partiallyoverlapped in some cases, and at this time collisions between thecontrol channels are reduced, and the number of times of blind detectionmay also be decreased to a certain degree. In addition, in the thirdexample, the search spaces corresponding to the control channels thathave two same signaling lengths or different signaling lengths may berespectively determined, that is, the search spaces are independent andhave no dependence relationships or rules. For example, the searchspaces corresponding to the control channels that have two differentsignaling lengths may be respectively determined according to differentsignaling length IDs corresponding to the two different signalinglengths, or respectively determined according to component carrier IDsof the control channels that have the two different signaling lengths,or determined by any one or a combination of the foregoing correlativequantities; and/or, the search spaces corresponding to the controlchannels that have two different/same signaling lengths may also berespectively determined according to the different/same signaling lengthIDs corresponding to the two different/same signaling lengths, orrespectively determined according to component carrier IDs of thecontrol channels that have the two different/same signaling lengths, ordetermined by any one or a combination of the foregoing correlativequantities. In conclusion, the selection of specific ID parameters isnot limited in the embodiments of the present disclosure. Thereby, thesearch spaces corresponding to the control channels that have the twosame signaling lengths or different signaling lengths may be the same ordifferent, that is, the search spaces corresponding to the controlchannels that have the signaling lengths and are corresponding to thecomponent carriers may be partially overlapped, which depends on therandomization of the parameter for determining the search spaces actingon the method for determining the search spaces, or an independentdetermination method, and the present disclosure is not limited in thisaspect.

Furthermore, the transmitting equipment may set a search spacecorresponding to control channels that have at least one specifiedsignaling length and are corresponding to the UE as a search space to bepreferentially detected, and set a search space corresponding to controlchannels that have other non-specified signaling lengths and arecorresponding to the UE as a search space to be extensionally detected.As the component carrier bearing the control channels may bepreferentially selected as the main carrier of the UE, the main carrieris the component carrier requiring continuous detection performed by theUE that is in a connected state, and the main carrier has relativelygood channel conditions, so that the PDCCH corresponding to the UE has agood transmission performance, the signaling lengths of the PDCCHscorresponding to the main carrier may serve as specified signalinglengths, and the search space corresponding to the control channels thathave the signaling lengths of the PDCCHs and are corresponding to themain carrier is set as a search space to be preferentially detected. Inaddition, the search space corresponding to the control channels thathave the signaling lengths of the PDCCH that appear more times with ahigher probability is set as a search space to be preferentiallydetected, and the search space corresponding to the control channelsthat have other signaling lengths of the PDCCH is set as a search spaceto be extensionally detected. The method for determining the searchspace to be preferentially detected and the search space to beextentionally detected, and the information such as signaling lengthsand formats included in the search space to be preferentially detectedand the search space to be extentionally detected are specified in theprotocol, and may be explicitly obtained by the receiving andtransmitting sides through algorithms in the standard protocol ornotified to the receiving equipment by the transmitting side throughdedicated signaling, including high layer semistatic signaling, physicallayer dynamic signaling, and a media access layer control channel.

The transmitting equipment preferentially schedules the control channelthat has the signaling length of the PDCCH and is corresponding to themain carrier, or preferentially schedules the control channel that hasthe signaling length of the PDCCH that appears more times with a higherprobability, or preferentially schedules the control channel that hasthe signaling length of the PDCCH determined in other modes for datatransmission. In addition, the search space to be preferentiallydetected and the search space to be extensionally detected may be or maynot be overlapped, and if not overlapped, for an aggregation level, thesearch space corresponding to the control channels that have thesignaling lengths of the PDCCH is formed of all the CCE numbers of thesearch space to be preferentially detected and the search space to beextensionally detected; while if overlapped, the search spacecorresponding to the control channels that have the signaling lengths ofthe PDCCH is formed of all the CCE numbers included in the search spaceto be preferentially detected or the search space to be extensionallydetected.

In the LTE, for some UEs requiring monitoring of the control channels,blind detection needs to be performed on the public search spacecorresponding to at least one component carrier. Therefore, when thepublic search space has residual CCE resource for mapping andtransmitting the only one PDCCH of the UE, the PDCCH of the UE can beborne in the public search space for transmission. At this time, whenthe public search space has no residual CCE resource for mapping andtransmitting the PDCCH of the UE, only one or multiple PDCCHs that havethe signaling lengths of the PDCCHs and are corresponding to the maincarrier of the UE or the signaling lengths of the PDCCHs that appearmore times with a higher probability are borne in the search space to bepreferentially detected for transmission; and if other signaling lengthsof the PDCCHs still exist, the PDCCHs having the other signaling lengthsof the PDCCHs are borne in the search space to be extentionally detectedfor mapping and transmission.

In this embodiment, the transmitting equipment can allocate multiplesearch spaces on one or more downlink component carriers according tothe signaling lengths of multiple control channels corresponding toPUSCHs scheduled by multiple uplink component carriers and/or PDSCHsscheduled by multiple downlink component carriers. In the allocatedsearch space, the control channel that has each signaling length can bemapped, and for the transmitting equipment, the search space is the CCEregion in which the transmitting equipment can map the PDCCH; while forthe receiving equipment, the search space is the CCE region determinedthrough blind detection of the control channels by the receivingequipment. The transmitting equipment may allocate independent searchspaces to control channels that have each/multiple format(s) accordingto the types of the signaling lengths of the control channels that theUE may transmit in a period of time, the search spaces may be allocatedon one or more component carriers, and the sizes of the search spacesmay be configured according to the appearing number and/or probabilityof each signaling length corresponding to the UE, or may be changedaccording to the initial search space corresponding to each componentcarrier, so that the search space corresponding to the control channelthat has each signaling length and the number of CCEs included in thesearch space corresponding to the PDCCH can be changed according todemands on one or more component carriers. For example, when theappearing number and/or probability of the PDCCHs having a certainsignaling length is high, the number of CCEs included in thecorresponding search space is increased, so that the number of controlchannels for transmission that can be accommodated is increased, and theprobability of collisions during transmission of control channels withother UEs is reduced. On the contrary, when the appearing number and/orprobability of the PDCCHs having a certain signaling length is low, thenumber of CCEs included in the corresponding search space is decreased,so that the resource for transmission of control channels is little,thereby reducing the number of times of blind detection performed by theUE on the control channels, decreasing the complexity of processing bythe UE, and saving the power consumption of the battery.

In this embodiment, the component carrier may also be replaced by acomponent carrier pair, a component carrier group, a component carrierset or a component carrier pair set, the component carrier ID may bereplaced by a component carrier pair ID, a component carrier group ID, acomponent carrier set ID or a component carrier pair set ID. Therefore,the description of the component carrier is also applicable to thecomponent carrier pair, the component carrier group, the componentcarrier set or the component carrier pair set. For example, in thepresence of multiple component carriers, in order to reduce the numberof search spaces and the complexity of detection by the UE, thecomponent carriers or component carrier pairs can be grouped, and eachgroup is a component carrier set. At this time, the component carriersmay be replaced by the component carrier sets.

FIG. 5 is a flow chart of a method for detecting a control channelaccording to Embodiment 3 of the present disclosure. As shown in FIG. 5,the method for detecting a control channel includes the following steps.

In step 51, for the same aggregation level, according to a signalinglength of a control channel corresponding to a component carrier, acorresponding search space is determined for at least two controlchannels that have the same signaling length, so as to enable the atleast two control channels that have the same signaling length to usethe same search space.

In step 52, in the determined same search space, the control channelsthat have the signaling lengths included in the same search space aredetected.

The enabling the at least two control channels that have the samesignaling length to use the same search space includes: enabling the atleast two control channels that have the same signaling length and arecorresponding to different component carriers to use the same searchspace; or enabling the at least two control channels that have the samesignaling length and are corresponding to the same component carrier touse the same search space.

Steps 51 and 52 provide the method in the case that the at least twocontrol channels that have the same signaling length exist in one ormore component carriers, and when at least two control channels thathave different signaling lengths exist in one or more componentcarriers, steps 51 and 52 may also be the follows steps or performedtogether with the following steps.

For the same aggregation level, according to a signaling length of acontrol channel corresponding to a component carrier, correspondingsearch spaces are determined for at least two control channels that havedifferent signaling lengths respectively, so as to enable the at leasttwo control channels that have different signaling lengths to use thedifferent search spaces in at least one time transmission unit; and inthe determined different search spaces, the control channels that havethe signaling lengths included in the different search spaces aredetected.

The determining the corresponding search spaces for the at least twocontrol channels that have different signaling lengths respectively, soas to enable the at least two control channels that have differentsignaling lengths to use the different search spaces in the at least onetime transmission unit includes: determining corresponding search spacesrespectively for at least two control channels that have differentsignaling lengths and are corresponding to different component carriers,so as to enable the at least two control channels that have differentsignaling lengths to use the different search spaces in at least onetime transmission unit; or determining corresponding search spacesrespectively for at least two control channels that have differentsignaling lengths and are corresponding to the same component carrier,so as to enable the at least two control channels that have differentsignaling lengths to use the different search spaces in at least onetime transmission unit.

During the detecting, by the UE, of the control channels, the method fordetermining a search space corresponding to a control channel accordingto a signaling length of the control channel corresponding to acomponent carrier includes the following examples.

In a first example, the UE determines a start position and a size of thesearch space corresponding to the control channel. The method ofdetermining by the UE the start position of the search spacecorresponding to the control channel is as follows. According to asignaling length ID or a signaling length group ID, the start positionof the search space corresponding to the control channel is determined;or according to randomly one or more of: a signaling length ID or asignaling length group ID, and a UE ID, a control channel format ID,space division, a component carrier ID corresponding to the controlchannel, a subframe number or an aggregation level, the start positionof the search space corresponding to the control channel is determined.For example, reference can be made to the related description ofdetermination of the start position and size of the search space inEmbodiments 1 and 2 of the present disclosure.

In a second example, the UE determines the search space corresponding tothe control channel that has the signaling length according to aninitial search space corresponding to the control channel that has thesignaling length.

The method of determining by the UE the initial search spacecorresponding to the control channel that has the signaling length mayinclude the following cases.

In one case, the initial search space corresponding to the controlchannel that has the signaling length is obtained through the followingsteps.

The initial search space corresponding to each component carrier isdetermined, and the initial search space corresponding to the controlchannel that has each signaling length and is corresponding to the samecomponent carrier is the initial search space of the same componentcarrier.

At this time, according to randomly one or more of: a UE ID, spacedivision, a component carrier ID, a subframe number or an aggregationlevel, the initial search space corresponding to each component carrieris determined.

In another case, the initial search space corresponding to the controlchannel that has the signaling length is obtained through the followingsteps.

In step 1, the initial search space corresponding to the control channelthat has each signaling length and is corresponding to each componentcarrier is determined.

In step 2, if at least two same signaling lengths exist in the signalinglengths corresponding to the same component carrier, the controlchannels that have the at least two same signaling lengths are enabledto use the same initial search space; and/or if at least two differentsignaling lengths exist in the signaling lengths corresponding to thesame component carrier, the control channels that have the at least twodifferent signaling lengths are enabled to use different initial searchspaces in at least one time transmission unit.

At this time, the start position of the initial search spacecorresponding to the control channel that has each signaling length andis corresponding to each component carrier can be determined accordingto a signaling length ID or a signaling length group ID; or the startposition of the initial search space corresponding to the controlchannel that has each signaling length and is corresponding to eachcomponent carrier can be determined according to randomly one or moreof: a signaling length ID or a signaling length group ID, and a UE ID, acontrol channel format ID, space division, a component carrier IDcorresponding to the control channel, a subframe number or anaggregation level.

In yet another case, if the component carriers are grouped, the initialsearch space corresponding to the control channel that has the signalinglength is obtained through the following steps.

The initial search space corresponding to each component carrier groupis determined, in which the initial search space corresponding to thecontrol channel that has each signaling length and is corresponding tothe same component carrier group is the initial search space of the samecomponent carrier group.

At this time, according to randomly one or more of: a UE ID, spacedivision, a component carrier group ID, a subframe number or anaggregation level, the initial search space corresponding to eachcomponent carrier group is determined.

After the UE determines the initial search space corresponding to thecontrol channel that has the signaling length, the method fordetermining the search space corresponding to the control channel thathas the signaling length according to an initial search spacecorresponding to the control channel that has the signaling length is asfollows.

If one signaling length of a control channel corresponding to onecomponent carrier is different from one signaling length of a controlchannel corresponding to another one or more component carriers, thesearch space corresponding to the control channel that has one signalinglength and is corresponding to the one component carrier and the anotherone or more component carriers is completely or partially the same asthe initial search space corresponding to the control channel that hasthe one signaling length; and/or

If one signaling length of a control channel corresponding to onecomponent carrier is the same as one signaling length of a controlchannel corresponding to another one or more component carriers, thesearch space corresponding to the control channel that has one signalinglength and is corresponding to the one component carrier and the anotherone or more component carriers is all or a part of a search space formedof the initial search space corresponding to the control channel thathas the one signaling length and is corresponding to the one componentcarrier and the initial search space corresponding to the controlchannel that has the one signaling length and is corresponding to theanother one or more component carriers. The search space correspondingto the control channel that has the one signaling length being a part ofthe search space formed by the initial search spaces corresponding tothe control channels that have the signaling lengths means that: Thesearch space corresponding to the control channel that has the onesignaling length is a certain subset of all the initial search spacescorresponding to the control channels that have the signaling length, orthe CCEs are increased or reduced according to the subset.

After determining the corresponding search space of the control channelaccording to the signaling length, the UE can perform, in the determinedsearch space, blind detection on the control channels that have thesignaling lengths included in the search space.

Furthermore, in the method for mapping a control channel, the controlchannel that has the specified signaling length is mapped to the searchspace to be preferentially detected, and the control channels that havenon-specified signaling lengths are mapped to the search space to beextentionally detected. Correspondingly, if control channels that havespecified signaling lengths exist in the search space to bepreferentially detected, it is detected whether control channels thathave non-specified signaling lengths exist in the search space to beextentionally detected; otherwise, it is not detected whether controlchannels that have non-specified signaling lengths exist in the searchspace to be extentionally detected.

For example, during blind detection of the control channels by the UE,in addition to the detection of the public search space, it may be firstdetermined whether the signaling length corresponding to the UE existsin the search space to be preferentially detected. If the UE detects thecontrol channel that has the signaling length of the UE itself in thesearch space to be preferentially detected, the UE continues detectionin the search space to be extentionally detected, which stops only whenblind detection is performed on all search spaces requiring detection.If the UE does not detect the control channel that has the signalinglength of the UE itself in the search space to be preferentiallydetected, the UE no longer continues detection in the search space to beextentionally detected, and the detection stops directly.

In this embodiment, the control channel may be, for example, a PDCCH,but the present disclosure is not limited to the case that the controlchannel is a PDCCH. The description by taking the signaling length ofthe control channel as an example in this embodiment is also applicableto a format set or a signaling length set of the control channel.

In this embodiment, the UE may determine the start position and size ofthe search space according to the control channel that has the signalinglength, and then perform detection in the determined search space. Asthe start position and size of the search space can be flexiblyconfigured at the network side, the probability of collisions betweenthe control channels is reduced. In addition, by differentiating thesearch space to be preferentially detected from the search space to beextentionally detected, the UE can be prevented from performingunnecessary blind detection in all the search spaces, thereby reducingthe number of times of blind detection of the control channels by theUE, so as to further save the power consumption of the UE and avoidexcessive blind detection errors.

FIG. 6 is a schematic structural view of a transmitting equipmentaccording to Embodiment 4 of the present disclosure. As shown in FIG. 6,the transmitting equipment includes a first processing module 61 and asecond processing module 62. The first processing module 61 includes afirst search space determination module 611 and a first mapping module612. The first search space determination module 611 is configured to,for the same aggregation level, according to a signaling length of acontrol channel corresponding to a component carrier, determine acorresponding search space for at least two control channels that havethe same signaling length, so as to enable the at least two controlchannels that have the same signaling length to use the same searchspace. The first mapping module 612 is configured to map the at leasttwo control channels that have the same signaling length to thecorresponding search space determined by the first search spacedetermination module 611.

The second processing module 62 includes a second search spacedetermination module 621 and a second mapping module 622. The secondsearch space determination module 621 is configured to, for the sameaggregation level, according to a signaling length of a control channelcorresponding to a component carrier, determine corresponding searchspaces for at least two control channels that have different signalinglengths respectively, so as to enable the at least two control channelsthat have different signaling lengths to use the different search spacesin at least one time transmission unit. The second mapping module 622 isconfigured to respectively map the at least two control channels thathave different signaling lengths to the corresponding search spacesdetermined by the second search space determination module 621.

Furthermore, the first search space determination module 611 may includea first determination unit 6111 or a second determination unit 6112.

The first determination unit 6111 is configured to, according to asignaling length of a control channel corresponding to a componentcarrier, determine a corresponding search space for at least two controlchannels that have the same signaling length, so as to enable the atleast two control channels that have the same signaling length and arecorresponding to different component carriers to use the same searchspace. The second determination unit 6112 is configured to, according toa signaling length of a control channel corresponding to a componentcarrier, determine a corresponding search space for at least two controlchannels that have the same signaling length, so as to enable the atleast two control channels that have the same signaling length and arecorresponding to the same component carrier to use the same searchspace.

The second search space determination module 621 includes a thirddetermination unit 6211 or a fourth determination unit 6212.

The third determination unit 6211 is configured to respectivelydetermine corresponding search spaces for at least two control channelsthat have different signaling length and are corresponding to differentcomponent carriers, so as to enable the at least two control channelsthat have different signaling lengths to use the different search spacesin at least one time transmission unit. The fourth determination unit6212 is configured to respectively determine corresponding search spacesfor at least two control channels that have different signaling lengthand are corresponding to the same component earlier, so as to enable theat least two control channels that have different signaling lengths touse the different search spaces in at least one time transmission unit.

Furthermore, the first search space determination module 611 and/or thesecond search space determination module 621 may further include aposition determination unit 63 and/or an initial search space unit 64.The position determination unit 63 is configured to determine a startposition and a size of the search space corresponding to the controlchannel. The initial search space unit 64 is configured to determine thesearch space corresponding to the control channel that has the signalinglength according to an initial search space corresponding to the controlchannel that has the signaling length.

The position determination unit 63 includes a start positiondetermination subunit 631.

The start position determination subunit 631 is configured to, accordingto a signaling length ID or a signaling length group ID, determine thestart position of the search space corresponding to the control channel;or according to randomly one or more of: a signaling length ID or asignaling length group ID, and a UE ID, a control channel format ID,space division, a component carrier ID corresponding to the controlchannel, a subframe number or an aggregation level, determine the startposition of the search space corresponding to the control channel. Forexample, reference can be made to the related description in Embodiments1 and 2 of the present disclosure for the method.

The initial search space unit 64 includes a first initial search spacesubunit 641, a second initial search space subunit 642 or a thirdinitial search space subunit 643, and further includes a fourth initialsearch space subunit 644.

The first initial search space subunit 641 is configured to determinethe initial search space corresponding to each component carrier, inwhich the initial search space corresponding to the control channel thathas each signaling length and is corresponding to the same componentcarrier is the initial search space of the same component carrier.

The second initial search space subunit 642 is configured to determinethe initial search space corresponding to the control channel that haseach signaling length and is corresponding to each component carrier, inwhich if at least two same signaling lengths exist in the signalinglengths corresponding to the same component carrier, the controlchannels that have the at least two same signaling lengths are enabledto use the same initial search space; and/or if at least two differentsignaling lengths exist in the signaling lengths corresponding to thesame component carrier, the control channels that have the at least twodifferent signaling lengths are enabled to use different initial searchspaces in at least one time transmission unit.

The third initial search space subunit 643 is configured to determinethe initial search space corresponding to each component carrier groupafter the component carriers are grouped, in which the initial searchspace corresponding to the control channel that has each signalinglength and is corresponding to the same component carrier group is theinitial search space of the same component carrier group.

The fourth initial search space subunit 644 is configured to, if onesignaling length of a control channel corresponding to one componentcarrier is different from one signaling length of a control channelcorresponding to another one or more component carriers, make that thesearch space corresponding to the control channel that has one signalinglength and is corresponding to the one component carrier and the anotherone or more component carriers is completely or partially the same asthe initial search space corresponding to the control channel that hasthe one signaling length; and/or if one signaling length of a controlchannel corresponding to one component carrier is the same as onesignaling length of a control channel corresponding to another one ormore component carriers, make that the search space corresponding to thecontrol channel that has one signaling length and is corresponding tothe one component carrier and the another one or more component carriersis all or a part of a search space formed of the initial search spacecorresponding to the control channel that has the one signaling lengthand is corresponding to the one component carrier and the initial searchspace corresponding to the control channel that has the one signalinglength and is corresponding to the another one or more componentcarriers.

For example, the method of determining the search space by the initialsearch space unit 64 according to the initial search space correspondingto the control channel that has the signaling length may include thefollowing cases.

In a first case, the first initial search space subunit 641 determinesthe initial search space corresponding to each component carrier, inwhich the initial search space corresponding to the control channel thathas each signaling length and is corresponding to the same componentcarrier is the initial search space of the same component carrier.

At this time, the start position of the initial search spacecorresponding to each component carrier may be determined according torandomly one or more of: a UE ID, space division, a component carrierID, a subframe number or an aggregation level.

In a second case, the second initial search space subunit 642 determinesthe initial search space corresponding to the control channel that haseach signaling length and is corresponding to each component carrier, inwhich if at least two same signaling lengths exist in the signalinglengths corresponding to the same component carrier, the controlchannels that have the at least two same signaling lengths are enabledto use the same initial search space; and/or if at least two differentsignaling lengths exist in the signaling lengths corresponding to thesame component carrier, the control channels that have the at least twodifferent signaling lengths are enabled to use the different initialsearch spaces in at least one time transmission unit.

At this time, the start position of the initial search spacecorresponding to the control channel that has each signaling length andis corresponding to each component carrier may be determined accordingto a signaling length ID or a signaling length group ID; or the startposition of the initial search space corresponding to the controlchannel that has each signaling length and is corresponding to eachcomponent carrier is determined according to randomly one or more of: asignaling length ID or a signaling length group ID, and a UE ID, acontrol channel format ID, space division, a component carrier IDcorresponding to the control channel, a subframe number or anaggregation level.

In a third case, the third initial search space subunit 643 determinesthe initial search space corresponding to each component carrier group,in which the initial search space corresponding to the control channelthat has each signaling length and is corresponding to the samecomponent carrier group is the initial search space of the samecomponent carrier group. In the third case, the transmitting equipmentmay further include a grouping unit, configured to group the componentcarriers. The grouping method includes, but is not limited to, dividingeach pair of uplink and downlink component carriers into a group; ordividing component carriers having the same transmission mode into agroup; or dividing the component carriers having the same transmissionbandwidth into a group; or dividing the component carriers having thesame number of transmission antennas into a group.

At this time, the start position of the initial search spacecorresponding to each component carrier group may be determinedaccording to randomly one or more of: a UE ID, space division, acomponent carrier group ID, a subframe number or an aggregation level.

In this embodiment, reference can be made to the related description inEmbodiments 1 and 2 of the present disclosure for the specific method ofdetermining the initial search space corresponding to the controlchannel that has the signaling length by the initial search space unit.

After the initial search space unit 64 determines the initial searchspace corresponding to the control channel that has the signalinglength, the determining, by the fourth initial search space subunit 644,the search space corresponding to the control channel that has thesignaling length according to the initial search space corresponding tothe control channel that has the signaling length includes the followingstep.

If one signaling length of a control channel corresponding to onecomponent carrier is different from one signaling length of a controlchannel corresponding to another one or more component carriers, thesearch space corresponding to the control channels that have onesignaling length and are corresponding to the one component carrier andthe another one or more component carriers is completely or partiallythe same as the initial search space corresponding to the controlchannel that has the one signaling length.

Alternatively, if one signaling length of a control channelcorresponding to one component carrier is the same as one signalinglength of a control channel corresponding to another one or morecomponent carriers, the search space corresponding to the controlchannel that has one signaling length and is corresponding to the onecomponent carrier and the another one or more component carriers is allor a part of a search space formed of the initial search spacecorresponding to the control channel that has the one signaling lengthand is corresponding to the one component carrier and the initial searchspace corresponding to the control channel that has the one signalinglength and is corresponding to the another one or more componentcarriers. For example, reference can be made to the related descriptionin Embodiments 1 and 2 of the present disclosure.

Furthermore, the first search space determination module 611 and/or thesecond search space determination module 621 are further configured toset the search space corresponding to the control channel that has thedetermined signaling length as a search space to be preferentiallydetected, and set the search space corresponding to the control channelthat has the non-determined signaling length as a search space to beextensionally detected.

For the same aggregation level, the transmitting equipment provided inthis embodiment may set different search spaces according to signalinglengths of the control channels, thereby reducing conflicts between thecontrol channels. Also, the transmitting equipment may further make thesearch spaces corresponding to the control channels that have the samesignaling length overlapped or partially overlapped, thereby reducingthe number of times of blind detection by the UE; or make the searchspaces corresponding to the control channels that have differentsignaling lengths not overlapped, so as to implicitly notify thesignaling length corresponding to the search space to the UE, therebysaving the signaling overhead. The transmitting equipment may furthermap the determined search space corresponding to the control channelthat has the signaling length to the search space to be preferentiallydetected, so as to enable the UE to preferentially detect the controlchannels in the determined search space corresponding to the controlchannel that has the signaling length, thereby reducing the number oftimes of blind detection.

FIG. 7 is a schematic structural view of a receiving equipment accordingto Embodiment 5 of the present disclosure. As shown in FIG. 7, thereceiving equipment includes a first processing module 71 and/or asecond processing module 72. The first processing module 71 includes afirst search space determination module 711 and a first detection module712. The first search space determination module 711 is configured to,for the same aggregation level, according to a signaling length of acontrol channel corresponding to a component carrier, determine acorresponding search space for at least two control channels that havethe same signaling length, so as to enable the at least two controlchannels that have the same signaling length to use the same searchspace. The first detection module 712 is configured to, in the samesearch space determined by the first search space determination module711, detect the control channels that have the signaling lengthsincluded in the same search space.

The second processing module 72 includes a second search spacedetermination module 721 and a second detection module 722. The secondsearch space determination module 721 is configured to, for the sameaggregation level, according to a signaling length of a control channelcorresponding to a component carrier, determine corresponding searchspaces for at least two control channels that have different signalinglengths respectively, so as to enable the at least two control channelsthat have different signaling lengths to use the different search spacesin at least one time transmission unit. The second detection module 722is configured to respectively detect, in the different search spacesdetermined by the second search space determination module 721, thecontrol channels that have the signaling lengths included in thedifferent search spaces.

Furthermore, the first search space determination module 711 may furtherinclude a first determination unit 7111 or a second determination unit7112.

The first determination unit 7111 is configured to, according to asignaling length of a control channel corresponding to a componentcarrier, determine a corresponding search space for at least two controlchannels that have the same signaling length, so as to enable the atleast two control channels that have the same signaling length and arecorresponding to different component carriers to use the same searchspace. The second determination unit 7112 is configured to, according toa signaling length of a control channel corresponding to a componentcarrier, determine a corresponding search space for at least two controlchannels that have the same signaling length, so as to enable the atleast two control channels that have the same signaling length and arecorresponding to the same component carrier to use the same searchspace.

The second search space determination module 721 includes a thirddetermination unit 7211 or a fourth determination unit 7212.

The third determination unit 7211 is configured to respectivelydetermine corresponding search spaces for control channels that have atleast two different signaling length and are corresponding to differentcomponent carriers, so as to enable the at least two control channelsthat have different signaling lengths to use the different search spacesin at least one time transmission unit. The fourth determination unit7212 is configured to respectively determine corresponding search spacesfor at least two control channels that have different signaling lengthand are corresponding to the same component carrier, so as to enable theat least two control channels that have different signaling lengths touse the different search spaces in at least one time transmission unit.

The first search space determination module 711 and/or the second searchspace determination module 721 may further include a positiondetermination unit 73 and/or an initial search space unit 74.

The position determination unit 73 is configured to determine a startposition and a size of the search space corresponding to the controlchannel. The initial search space unit 74 is configured to determine thesearch space corresponding to the control channel that has the signalinglength according to an initial search space corresponding to the controlchannel that has the signaling length. For example, reference can bemade to the related description in Embodiments 1 and 2 of the presentdisclosure.

Furthermore, the position determination unit 73 includes a startposition determination subunit 731.

The start position determination subunit 731 is configured to, accordingto a signaling length ID or a signaling length group ID, determine thestart position of the search space corresponding to the control channel;or according to randomly one or more of: a signaling length ID or asignaling length group ID, and a UE ID, a control channel format ID,space division, a component carrier ID corresponding to the controlchannel, a subframe number or an aggregation level, determine the startposition of the search space corresponding to the control channel.

The initial search space unit 74 includes a first initial search spacesubunit 741, a second initial search space subunit 742 or a thirdinitial search space subunit 743, and further includes a fourth initialsearch space subunit 744.

The first initial search space subunit 741 is configured to determinethe initial search space corresponding to each component carrier, inwhich the initial search space corresponding to the control channel thathas each signaling length and is corresponding to the same componentcarrier is the initial search space of the same component carrier.

The second initial search space subunit 742 is configured to determinethe initial search space corresponding to the control channel that haseach signaling length and is corresponding to each component carrier, inwhich if at least two same signaling lengths exist in the signalinglengths corresponding to the same component carrier, the controlchannels that have the at least two same signaling lengths are enabledto use the same initial search space; and/or if at least two differentsignaling lengths exist in the signaling lengths corresponding to thesame component carrier, the control channels that have the at least twodifferent signaling lengths are enabled to use the different initialsearch spaces in at least one time transmission unit.

The third initial search space subunit 743 is configured to determinethe initial search space corresponding to each component carrier groupafter the component carriers are grouped, in which the initial searchspace corresponding to the control channel that has each signalinglength and is corresponding to the same component carrier group is theinitial search space of the same component carrier group.

The fourth initial search space subunit 744 is configured to, if onesignaling length of a control channel corresponding to one componentcarrier is different from one signaling length of a control channelcorresponding to another one or more component carriers, make that thesearch space corresponding to the control channel that has one signalinglength and is corresponding to the one component carrier and the anotherone or more component carriers is completely or partially the same asthe initial search space corresponding to the control channel that hasthe one signaling length; and/or if one signaling length of a controlchannel corresponding to one component carrier is the same as onesignaling length of a control channel corresponding to another one ormore component carriers, make that the search space corresponding to thecontrol channel that has one signaling length and is corresponding tothe one component carrier and the another one or more component carriersis all or a part of a search space formed of the initial search spacecorresponding to the control channel that has the one signaling lengthand is corresponding to the one component carrier and the initial searchspace corresponding to the control channel that has the one signalinglength and is corresponding to the another one or more componentcarriers.

Furthermore, after the first search space determination module 711determines the search space corresponding to the control channelaccording to the signaling length, the first detection module 712 isfurther configured to perform blind detection, in the determined samesearch space, on the control channels that have signaling lengthsincluded in the same search space. After the second search spacedetermination module determines the search space corresponding to thecontrol channel according to the signaling length, the second detectionmodule is further configured to perform blind detection, in thedetermined different search spaces, on the control channels that havethe signaling lengths included in the different search spaces.

In addition, when the search space includes the search space to bepreferentially detected, if the control channel that has the determinedsignaling length exists in the search space to be preferentiallydetected, the first detection module 712 and/or the second detectionmodule 722 detect whether the control channel that has thenon-determined signaling length exists in the search space to beextensionally detected. If the control channel that has the determinedsignaling length does not exist in the search space to be preferentiallydetected, the first detection module 712 and/or the second detectionmodule 722 do not detect whether the control channel that has thenon-determined signaling length exists in the search space to beextensionally detected.

In this embodiment, the receiving equipment may be a UE. In thisembodiment, reference can be made to the related description inEmbodiment 1 of the present disclosure for the specific method ofdetermining, by the receiving equipment, the search space according tothe signaling length of the control channel for the same aggregationlevel and detecting the control channel in the search space.

For the same aggregation level, the receiving equipment provided in thisembodiment may determine the search space according to the signalinglength of the control channel, so as to detect the control channel thathas the signaling length in the search space. Moreover, as the searchspaces corresponding to the component carriers having the same signalinglength of the corresponding control channels may be overlapped orpartially overlapped, the number of times of blind detection by the UEis reduced. In addition, the UE preferentially detects the search spacecorresponding to the control channel that has the determined signalinglength, so as to further reduce the number of times of blind detection.

It should be noted that persons of ordinary skill in the art shouldunderstand that all or a part of the processes of the method accordingto the embodiments of the present disclosure may be implemented by aprogram instructing relevant hardware. The program may be stored in acomputer readable storage medium. When the program is run, the processesof the method according to the embodiments of the present disclosure areperformed. The storage medium may be a magnetic disk, an optical disk, aread-only memory (ROM), or a random access memory (RAM).

In addition, the functional units in the embodiments of the presentdisclosure may either be integrated in a processing module, or exist asseparate physical units; alternatively, two or more units may beintegrated in one module. The integrated modules may be implemented inthe form of hardware or software functional modules. If implemented inthe form of software functional modules and sold or used as anindependent product, the integrated modules may also be stored in acomputer readable storage medium. The storage medium may be a ROM, amagnetic disk, or an optical disk.

The specific embodiments are not intended to limit the scope of thepresent disclosure. Any modifications, equivalent replacements, andimprovements made by persons of ordinary skill in the art shall fallwithin the scope of the present disclosure. Therefore, the protectionscope of the present disclosure is subject to the appended claims.

1. A method for mapping a control channel, comprising: for the sameaggregation level, according to a signaling length of a control channelcorresponding to a component carrier, determining a corresponding searchspace for at least two control channels that have the same signalinglength, so as to enable the at least two control channels that have thesame signaling length to use the same search space, and mapping the atleast two control channels that have the same signaling length to thedetermined corresponding search space; and for the same aggregationlevel, according to a signaling length of a control channelcorresponding to a component carrier, determining corresponding searchspaces for at least two control channels that have different signalinglengths respectively, so as to enable the at least two control channelsthat have different signaling lengths to use the different search spacesin at least one time transmission unit, and respectively mapping the atleast two control channels that have different signaling lengths to thedetermined corresponding search spaces.
 2. The method for mapping acontrol channel according to claim 1, wherein the enabling the at leasttwo control channels that have the same signaling length to use the samesearch space comprises: enabling at least two control channels that havethe same signaling length and are corresponding to different componentcarriers to use the same search space; or enabling at least two controlchannels that have the same signaling length and are corresponding tothe same component carrier to use the same search space.
 3. The methodfor mapping a control channel according to claim 1, wherein thedetermining the corresponding search space for the at least two controlchannels that have the same signaling length or the determining thecorresponding search spaces for the at least two control channels thathave the different signaling lengths respectively comprises: determininga search space corresponding to the control channel that has thesignaling length according to an initial search space corresponding tothe control channel that has the signaling length.
 4. The method formapping a control channel according to claim 3, wherein the initialsearch space corresponding to the control channel that has the signalinglength is obtained through the following step: determining an initialsearch space corresponding to each component carrier, wherein theinitial search space corresponding to the control channel that has eachsignaling length and is corresponding to the same component carrier isan initial search space of the same component carrier.
 5. The method formapping a control channel according to claim 3, wherein the determiningthe search space corresponding to the control channel that has thesignaling length according to the initial search space corresponding tothe control channel that has the signaling length comprises: if onesignaling length of a control channel corresponding to one componentcarrier is the same as one signaling length of a control channelcorresponding to another one or more component carriers, making that thesearch space corresponding to the control channel that has one signalinglength and is corresponding to the one component carrier and the anotherone or more component carriers is all or a part of a search space formedof the initial search space corresponding to the control channel thathas the one signaling length and is corresponding to the one componentcarrier and the initial search space corresponding to the controlchannel that has the one signaling length and is corresponding to theanother one or more component carriers.
 6. A method for detecting acontrol channel, comprising: for the same aggregation level, accordingto a signaling length of a control channel corresponding to a componentcarrier, determining a corresponding search space for at least twocontrol channels that have the same signaling length, so as to enablethe at least two control channels that have the same signaling length touse the same search space, and detecting, in the determined same searchspace, the control channels that have the signaling lengths comprised inthe same search space; for the same aggregation level, according to asignaling length of a control channel corresponding to a componentcarrier, determining corresponding search spaces for at least twocontrol channels that have different signaling lengths respectively, soas to enable the at least two control channels that have differentsignaling lengths to use different search spaces in at least one timetransmission unit, and respectively detecting, in the determineddifferent search spaces, the control channels that have the signalinglengths and are comprised in the different search spaces.
 7. The methodfor detecting a control channel according to claim 6, wherein theenabling the at least two control channels that have the same signalinglength to use the same search space comprises: enabling the at least twocontrol channels that have the same signaling length and arecorresponding to different component carriers to use the same searchspace; or enabling the at least two control channels that have the samesignaling length and are corresponding to the same component carrier touse the same search space.
 8. The method for detecting a control channelaccording to claim 6, wherein the determining the corresponding searchspace for the at least two control channels that have the same signalinglength or the determining the corresponding search spaces for the atleast two control channels that have different signaling lengthsrespectively comprises: determining a search space corresponding to thecontrol channel that has the signaling length according to an initialsearch space corresponding to the control channel that has the signalinglength.
 9. The method for detecting a control channel according to claim8, wherein the initial search space corresponding to the control channelthat has the signaling length is obtained through the following step:determining an initial search space corresponding to each componentcarrier, wherein the initial search space corresponding to the controlchannel that has each signaling length and is corresponding to the samecomponent carrier is an initial search space of the same componentcarrier.
 10. The method for detecting a control channel according toclaim 8, wherein the determining the search space corresponding to thecontrol channel that has the signaling length according to the initialsearch space corresponding to the control channel that has the signalinglength comprises: if one signaling length of a control channelcorresponding to one component carrier is the same as one signalinglength of a control channel corresponding to another one or morecomponent carriers, making that the search space corresponding to thecontrol channel that has one signaling length and is corresponding tothe one component carrier and the another one or more component carriersis all or a part of a search space formed of the initial search spacecorresponding to the control channel that has the one signaling lengthand is corresponding to the one component carrier and the initial searchspace corresponding to the control channel that has the one signalinglength and is corresponding to the another one or more componentcarriers.
 11. A transmitting equipment, comprising: a first processingmodule and a second processing module, wherein the first processingmodule comprises: a first search space determination module, configuredto, for the same aggregation level, according to a signaling length of acontrol channel corresponding to a component carrier, determine acorresponding search space for at least two control channels that havethe same signaling length, so as to enable the at least two controlchannels that have the same signaling length to use the same searchspace; and a first mapping module, configured to map the at least twocontrol channels that have the same signaling length to thecorresponding search space determined by the first search spacedetermination module; and the second processing module comprises: asecond search space determination module, configured to, for the sameaggregation level, according to a signaling length of a control channelcorresponding to a component carrier, determine corresponding searchspaces for at least two control channels that have different signalinglengths respectively, so as to enable the at least two control channelsthat have different signaling lengths to use the different search spacesin at least one time transmission unit; and a second mapping module,configured to respectively map the at least two control channels thathave different signaling lengths to the corresponding search spacesdetermined by the second search space determination module.
 12. Thetransmitting equipment according to claim 11, wherein the first searchspace determination module comprises: a first determination unit,configured to, according to a signaling length of a control channelcorresponding to a component carrier, determine a corresponding searchspace for at least two control channels that have the same signalinglength, so as to enable the at least two control channels that have thesame signaling length and are corresponding to different componentcarriers to use the same search space; or a second determination unit,configured to, according to a signaling length of a control channelcorresponding to a component carrier, determine a corresponding searchspace for at least two control channels that have the same signalinglength, so as to enable the at least two control channels that have thesame signaling length and are corresponding to the same componentcarrier to use the same search space.
 13. The transmitting equipmentaccording to claim 11, wherein the first search space determinationmodule and the second search space determination module furthercomprises: an initial search space unit, configured to, according to aninitial search space corresponding to the control channel that has thesignaling length, determine the search space corresponding to thecontrol channel that has the signaling length.
 14. The transmittingequipment according to claim 13, wherein the initial search space unitcomprises: a fourth initial search space subunit and a first initialsearch space subunit, the first initial search space subunit isconfigured to determine an initial search space corresponding to eachcomponent carrier, wherein the initial search space corresponding to thecontrol channel that has each signaling length and is corresponding tothe same component carrier is an initial search space of the samecomponent carrier; and the fourth initial search space subunit isconfigured to, if one signaling length of a control channelcorresponding to one component carrier is the same as one signalinglength of a control channel corresponding to another one or morecomponent carriers, make that the search space corresponding to thecontrol channel that has one signaling length and is corresponding tothe one component carrier and the another one or more component carriersis all or a part of a search space formed of the initial search spacecorresponding to the control channel that has the one signaling lengthand is corresponding to the one component carrier and the initial searchspace corresponding to the control channel that has the one signalinglength and is corresponding to the another one or more componentcarriers.
 15. A receiving equipment, comprising: a first processingmodule and a second processing module, wherein the first processingmodule comprises: a first search space determination module, configuredto, for the same aggregation level, according to a signaling length of acontrol channel corresponding to a component carrier, determine acorresponding search space for at least two control channels that havethe same signaling length, so as to enable the at least two controlchannels that have the same signaling length to use the same searchspace; and a first detection module, configured to detect, in the samesearch space determined by the first search space determination module,the control channels that have the signaling lengths comprised in thesame search space; and the second processing module comprises: a secondsearch space determination module, configured to, for the sameaggregation level, according to a signaling length of a control channelcorresponding to a component carrier, determine corresponding searchspaces for at least two control channels that have different signalinglengths respectively, so as to enable the at least two control channelsthat have different signaling lengths to use the different search spacesin at least one time transmission unit; and a second detection module,configured to respectively detect, in the different search spacesdetermined by the second search space determination module, the controlchannels that have the signaling lengths comprised in the differentsearch spaces.
 16. The receiving equipment according to claim 15,wherein the first search space determination module comprises: a firstdetermination unit, configured to, according to a signaling length of acontrol channel corresponding to a component carrier, determine acorresponding search space for at least two control channels that havethe same signaling length, so as to enable the at least two controlchannels that have the same signaling length and are corresponding todifferent component carriers to use the same search space; or a seconddetermination unit, configured to, according to a signaling length of acontrol channel corresponding to a component carrier, determine acorresponding search space for at least two control channels that havethe same signaling length, so as to enable the at least two controlchannels that have the same signaling length and are corresponding tothe same component carrier to use the same search space.
 17. Thereceiving equipment according to claim 15, wherein the first searchspace determination module and/or the second search space determinationmodule further comprises: an initial search space unit, configured to,according to an initial search space corresponding to the controlchannel that has the signaling length, determine the search spacecorresponding to the control channel that has the signaling length. 18.The receiving equipment according to claim 17, wherein the initialsearch space unit comprises: a fourth initial search space subunit and afirst initial search space subunit, the first initial search spacesubunit is configured to determine an initial search space correspondingto each component carrier, wherein the initial search spacecorresponding to the control channel that has each signaling length andis corresponding to the same component carrier is an initial searchspace of the same component carrier; and the fourth initial search spacesubunit is configured to, if one signaling length of a control channelcorresponding to one component carrier is the same as one signalinglength of a control channel corresponding to another one or morecomponent carriers, make that the search space corresponding to thecontrol channel that has one signaling length and is corresponding tothe one component carrier and the another one or more component carriersis all or a part of a search space formed of the initial search spacecorresponding to the control channel that has the one signaling lengthand is corresponding to the one component carrier and the initial searchspace corresponding to the control channel that has the one signalinglength and is corresponding to the another one or more componentcarriers.